I went in mid to late October a few years ago. It was warm to hot during the day (85-95 degrees), but by 8:00 - 9:00 pm it usually dropped back into the 70's and even into the 60's towards midnight. I had a pair of jeans, a pair of lighter weight slacks, and a couple long sleeve shirts and didn't have a problem.
My wife, who is always cold, generally wore jeans and brought a sweater along at night.
Luggage and bags: That Is why I prefer the Samsonite Brand in travelling as my main travelling Bags are samsonite since they have the lightest hard cases and hybrid soft sided hard cases of luggage of any luggage brand. I usually pack light in going to a place since I have to tendency to shop around and las vegas is no different hence what I bought was just a few pieces of shirts, a rubber shoe, flip flop, toiletries ad a leather pair of shoe since I know I will be going on a shopping spree here. Samsonite luggage helps you add pounds to your baggage capacity since it is the lightest luggage and that means less chance of paying the excess baggage.
Luggage and bags:
Luggage with wheels. There is lots of walking, both from the plane if you brought carry on, and in the casino itself. I recommend a backpack for much of European travel, but it might be out of place in Las Vegas.
Clothing/Shoes/Weather Gear: Bring half of what you laid out on the bed. Unless you intend to dress to impress, stick to the basics. Comfortable shoes, slacks, and a reasonable number of shirts. Air conditioning can become uncomfortable, so perhaps a pajama top or long sleeve 'T' for night time wear. If you want a fancy dinner or two, then a light sports jacket would be in order.
Toiletries and Medical Supplies: Always at the top of my list are Tums. I tend to eat later than usual, and always a tad too much. Aspirins are readily available everywhere.
Photo Equipment: Compact cameras are great if you can convince your wife to carry it. SLR cameras will be in your way, plus pictures are frowned upon inside the casino. I used our little Sony camera a fair amount this past trip, but would have cursed my Canon SLR.
Clothing/Shoes/Weather Gear: I usually go to Las Vegas in warm weather and since it's sitting in the desert it can get HOT! However, the winter take sweaters, a coat or a jacket should be just about right. Since weather anywhere can be unpredictable, dress in layers. Some visitors were bundled up in scarves and hats, some visitors were in shorts and sandals. The high during the day was 50-60 degrees, and at night from 45- 50 degrees. For winter months dress slightly warmer.
Even though everyone says its dry heat and its not that hot... if you aren't used to the heat it still is extremely hot. Pack lots of cotton tanks. Even a night the weather is smothering.
Photo Equipment: Pitures everywhere so bring lots of film or an extra battery for your digital.
Luggage and bags:
When I travel in the states, my items are a bit different then the ones I take to Europe. I usually travel with less items that I can find here more readily. I do more shopping on these travels, so the clothing I take is also limited. But there are still items that I always take with me and of course, it all depends on the season as well. Following are a few items:
Clothing/Shoes/Weather Gear: 2 pair of slacks one black, the other any color depending on the season (depending on the season, linen or cotton for the spring/summer, wool/wool blend or polyester blend for fall/winter
1 black jacket to dress up the slacks or for casual dinning)
1 black dress (for evening dinning, show, opera, etc, or for a night out at a club)
1 pair of jeans and a pair of khakis or Capri’s (again, depending on the season)
2 skirts or shorts which can be worn either during the day or into the early evening
2 white t-shirts or tank tops
3 casual/dress shirts (sweaters in the winter)
1 pair of walking shoes for daytime touring
1 pair black shoes or sandals
2 bathing suits and 2 cover-ups
one week’s worth of undergarments
2-3 pajamas or oversized t-shirts for sleeping
Toiletries and Medical Supplies: 4 spare pairs of contact lenses
5-7 pair of trouser socks
contact lens solution
extra pair of sunglasses
blow dryer (never leave home without it)
cosmetics in a travel case
my favorite shampoo and conditioner in travel sizes
hand and body lotion travel size
Tylenol, allergy medication and any other medication I am taking at the time
Hair accessories, brush, hats or caps
Photo Equipment: 2 cameras, plenty of film and extra batteries for the camera
Guide books, itineraries and maps, extra ATM card for withdrawal from savings if my regular card fails, 2 credit cards, $500 in cash for just in case of emergency.
Extra travel bag to put all my purchases in.
What I tend to do if I am traveling during the colder season, I usually wear the jacket, a heavy sweater, wool pants, along with boots (these are items that would take up more space in the luggage).
Remember to adjust your packing to the location and time of year, and just go out there and enjoy your time wherever that may be.
Most nighttime places are casual in Vegas. Some restaurants do have a dress code. As for everything else, I saw people casually dressed at shows and in the casino at all hours.
As for some of the most popular clubs, there is a dress code of sorts. I'm not sure if it includes any of the outfits in the picture, but the people hitting the club scene were dressed up.
Luggage and bags:
Vegas is excruciatingly hot in the summer. And forget all that talk about "its a dry heat" 110 degrees is hot no matter how dry it is.
Clothing/Shoes/Weather Gear: Bring a bathing suit. And comfortable shoes, preferably sneakers. I had a pair of cute jelly sandals which melted on the pool deck. Before that, the vinyl cut into my foot and created some bad blisters. Skip the fashionable shoes and wear well broken in sandals or sneakers. Also, sunblock and a hat as, in case I didn't mention it, its hot out here.
Toiletries and Medical Supplies: Load up on sunblock and moisturizer. Did I mention that its hot here? Its also a dry heat, which can dry out your skin, so be prepared.
Luggage and bags:
1 large bag on wheels
Don't pack to make your room your home. You will not be spending much time in the room anyway. In fact, you may only get 3 or 4 hours of sleep a day if you sleep at all.
Clothing/Shoes/Weather Gear: 1 really fancy outfit with shoes
4 comfy outfits with comfy shoes
leave the jammies at home, you won't be sleeping much anyway.
Don't pack much. Lets face it, you are going to buy Las Vegas T-shirts, jackets, hats
Toiletries and Medical Supplies: The hotels have most of this stuff complimentary including blow dryers in each room. But you will need sunscreen and shades.
Photo Equipment: Must bring your camera
Camping/Beach/Outdoor Gear: Be real careful of the sun and the heat if you are not used to it. Always carry water with you and a hat isn't a bad idea either although you will probably be buying one that says Las Vegas on it.
Miscellaneous: Don't pack alot of stuff. We have everything here that you may need and most of it is free. You will be buying alot of souviners so leave lots of room in your bag.
When it's hot, it's hot, but when you go into the casinos, they keep them pretty cool.
You can wear anything anytime here. Look to your left, there will be someone with a tux and a bride on his arm, look to your right and you will see a couple chicks with just their bathing suit tops and some tacky shorts with a bad hair dye job. It just doesn't matter how you dress here, the fashion police refuse to have anything to do with Vegas. Sometimes you'll look around and think you've walked into the cast of Rocky Horror.
Luggage and bags:
Do yourself a favor and underpack. Most likely, you'll be so busy that you will hardly change. A carry-on bag is sufficient.
Clothing/Shoes/Weather Gear: Pack for hot weather (80% of the year) but if you're a wimpy girl like me, pack a light jacket to wear in the hotels. The AC is on so high and it gets cold if you are wearing a tank top. Pack comfortable shoes and keep in mind that almost everywhere in Vegas is casual. Even nightlife can be enjoyed in jeans most of the time.
Toiletries and Medical Supplies: The most important toiletry to pack is sun block b/c it is so expensive at the hotels. Maybe bring some tylenol for headaches (maybe from smoke in casinos, stress from losing money, or a hangover).
Photo Equipment: You'll probably just need one roll of film.
Camping/Beach/Outdoor Gear: Pack your bathing suit and take some reading material (to pretend to read as you people watch at the pool). I saw Evander Holyfield at the Bellagio pool last time I was in Vegas.
Miscellaneous: Some hotels now have alarm clock radios with cd players! So pack your favorite cds to enjoy in your hotel room.
In the summertime, afternoon temperatures will reach over 100 F.
Men [daytime] - hat, swim trunks, sun tan lotion, and sunglasses to aid in scoping. [nighttime] - dress to how you want to impress; Bond, James Bond
Women [daytime] - sun tan lotion, thong thhu thong thong thong, sunglases in aid in scoping.
[nighttime] - dress to how you want to impress; slinky
ADVICE FOR MEN:
During the day, anything goes! Shorts and t-shirts (even tank-tops) are okay in the nicer hotels.
At night be ready for anything.
You may--on the spur of the moment--decide to hit a nice bar in a 5-star hotel; so wear 'nice casual' in the evening (e.g. long pants, shirt with a collar, comfortable yet dressy shoes).
It could mean the difference between a 5 or 45 minute wait for a table.
ADVICE FOR WOMEN: Likewise.
What to wear: Yes, Las Vegas is in the desert. And, yes, the temperature gets to be about 115 degrees in the summer. But if you happen to be visiting in the winter (usually from Halloween to Valentine's Day), don't be fooled. A jacket is definitely recommended, especially if the wind is blowing. We know our blood is probably thin from living here, and we may not get blizzards, but consider this your warning -- it's a lot colder here than you'd think.
Miscellaneous: '...whatever you do, don't try to loose the farm...felt miserable afterwards'
Luggage and bags:
Depending on your length of stay, usually I only pack 1 bag because if you plan of staying a week or more you can have your clothes dropped off at the cleaners for rather a cheap price for service and they'yy be ready all cleaned or ironed, ready to wear
Clothing/Shoes/Weather Gear: At what time of the year is very important. During the late spring/summer, light clothing, t-shirts, shorts, sandals. Fall/Winter definitely dress warm with long sleeved shirts and jeans. Sweaters are a must. As a precaution, I always take a jacket with me, either light-to-heavy or heavy.
Toiletries and Medical Supplies: Really nothing here. Las Vegas has all of that for its tourists.
Photo Equipment: If you love taking pictures, definitely bring still camera and/or camcorder. You'll be glad you did.
In summer it goes without saying, shorts and Tee shirts are what is appropriate. Some dressy clothes for night. In spring, winter, fall, Jeans, and long sleve shirts, and light jacket would be good. It is kind of cool then.
Toiletries and Medical Supplies: None special needed.