It's hard to give you a single name that carries the sort of wide stock profile, but with clothing, and perhaps a few of the other stock lines, I would suggest www.viatrading.com in California. Few reasons, one being that they do export where many other do not. They have customer service that is second to none in the industry, really important if you are just starting out in the surplus market.
Product quality is another reason. Yes, they are a liquidator and that means they will have stock of varying quality, but they do section it well. So when you ask for a load of overstocks, you will get overstocks, and not a blend of overstocks and customer returns, or even worse, salvage as well.
I would suggest that when it comes to dealing in the surplus industry it's far more important to establish a good trustworthy relationship with a supplier first, even though they may well not supply everything you are looking for, then look at increasing your stock profile through other suppliers if required.