I pretty much buy all my gear.
The boots, gaiters, field cap, gas mask cannister, water bottle, mess tin, tunic and trousers, splinter camo smock from ebay
the patches, collar tabs and shoulder boards from Trident military:
http://www.tridentmilitary.com/
The assault badge, cotton shirt, ammo pouches, belt and buckle, y-strap, assault frame + bag and bread bag from soldier of fortune in the UK:
http://www.sofmilitary.co.uk/reenactors/index.asp
Hope that helps. I warn you, a descent WW2 load-out is expensive (but worth it).