The seller mybayer2008 on eBay has some really nice doll clothes, stands, wigs, elastic etc. I've ordered from them a couple times. They can also custom make doll clothes to specific colors or measurements. Link:
http://www.ebay.com/usr/mybayer2008?_trksid=p2047675.l2559
Doll Peddlar sells a ton of stuff from Pullip, to ABJD, to Tonner and more. DP sells dolls, as well as doll accessories. They also have an app on iTunes. Link:
http://www.dollpeddlar.com
SugarLattice makes adorable outfits for Pullips, 1/6 Volks, Blythe, Azone, and Obitsus. I think they also have YOSD stuff. SL makes adorable wigs for Pullip, Blythe, and 1/3 bjd, as well. SugarLattice also sells some adorable Pullips-- pre-owned, new, and custom. Link:
http://sugarlattice.storenvy.com
Dollheart also makes gorgeous outfits for BJD. I own the Bella Dark one--it's incredibly well made, lined, and looks fantastic. Link:
http://www.dollheart.com