If yopu travel in winter - it is better to have something really warm - sometimes it can be -20C - 30C, but not often. Be aware of snow in winter. Also, it often happens that after cold weather, warm weather is comming. It is not the best times in Kiev - too wet.
In summer, the weather changes - rain and sun. Usually it is not cold. In august can be really hot, up to 35 C. May is usually sunny and warm.
Shoes should be comfortable for walking as well as your clothes. But I guess you all know this.
Miscellaneous: If you will be cold, you can drink vodka to get warm. But not too much.
Luggage and bags:
Somethink like rucksack or a small easy bag. Be ready to walk a lot and it mostn't make you feel non-comfortable.
Clothing/Shoes/Weather Gear: Spare shoes. It's absolutely necessary, they must be comfortable. The landscape of Kyiv is very nice as a view but exhausting for tourists.
Don't try to observe the city in 1 day, which is perhaps possible for any other town in Ukraine, but definitely not Kyiv. Lying on the high hills, it makes you go up and down dozens times a day. You won't feel your legs after that.
Toiletries and Medical Supplies: I think, as usual, you should keep some medicins rom the headaiche.
And yes.. the very important point. For the people suffering of allergy! If you come in June in particular.
In Kyiv there are many trees and one of them is Lombardy poplar. When they're bloomy, the city is covered with poplar fluff, of which people with allergy almost suffocate. So just bear it in mind.
Photo Equipment: Photo or video camera,, usual tourists stuff
Camping/Beach/Outdoor Gear: If you come at summer time, take the swim-dress.
In this point Kyiv is the unique city where there are absolutely no problems with beaches and swimming.
Apart Dnipro river, there are a lot of lakes in all the districts of the town, so, wherever you will stay (in a hotel of at friends, private appartment) you'll find a place to escape the summer heat which is often almost unbearable.
Luggage and bags:
Bags are being packed regularly in Ukraine. In my travels I met a number of people who I would to some degree call friends. I recently began to think of what became of those people and with a few exceptions almost all have moved elswhere....places like Argentina, Spain, Germany and United States.
Miscellaneous: This is the best map Ive found of Ukraine. SUMMERY...In all Ive seen over 20 cities troughout the country and have done eveything from attend a wedding in a small unnamed rural town to almost being thrown in jail because my papers werent 'in order' to missing trains on a regular basis to being stranded in a small town over half my vacation to meeting some very nice people. The experience changed my life forever.........
If mayday then jeans and sweatshirts smart casual for nightlife
Toiletries and Medical Supplies: Andrex
Photo Equipment: Digital Camera or Mobile Phone Camera
Clothing/Shoes/Weather Gear: There's a lot to see and do in Kiev and walking is the best way to get there, so bring some comfortable and sturdy walking shoes.