Luggage and bags:
Scheveningen is a truely beach resort even in wintertime. And it is quite expensive so it should be waisted money for not bringing your own suitcase and bags ...
Clothing/Shoes/Weather Gear: For summertime bring your beachwear, lightweight cotton clothing, a nice shirt for the evenings and proper shoes when you want to visit the Casino (casual is fine, no sport clothes).
Ofcourse the modern times brought some changes. February, March, April and May may be the driest months. June and October are typically wet months. Though it can be opposite of this info, too! So donot forget to bring a raincoat and umbrella and a sweater for in the evenings (when freezingly cold).
For wintertime it can be realy cold and windy, so be prepared for it.
Toiletries and Medical Supplies: Sunglasses, sun-protection cream, tissues, (wet towels). Pharmacy is open on Saturday & Sunday (see any phonebook).
Photo Equipment: In Scheveningen there are some great shops to buy photo equipment, films are about the same price, and for digital photographs you can find plenty of digital photo-shops.
local voltage - 220V AC 50Hz
Camping/Beach/Outdoor Gear: It is well-known there are more sunny hours on the coast than there are inland. So >>>
bathing clothes, towel and sun-tan
a cooler bag for drinks (going to the parks, dunes and beach)
You can get a map of The Hague at the police stations.
There are a lot of sports to do in Scheveningen, get some informations so you will know what to bring ...
Miscellaneous: area code > 31 70
Banks 09.00-16.00 Mon-Fri
Offices 08.30-17.00 Mon-Fri
Shops 09.00-17.30 Mon-Sat (many shops open till 21.00 on Thurs)
time zone - GMT+1hr
Scheveningen loves its tips (even not necessary), a 15% service charge is normally added to the bill. So it is customary to leave small change, and to give small tips to porters and taxi drivers.
Clothing/Shoes/Weather Gear: It can be very windy in Scheveningen. So in summer pack sunscreen, sunglasses and sunhat. For the rest of the year take a wind and rain proof with you.