Boutiques:
Candy Fruit - English site (gothic/lolita/maid)
CDJapan.co.jp (various brands including moi-meme-moite)
Cosmates (bodyline/putumayo)
Dream Shoppe (various brands including hearte)
Maruione (various brands including victorian maiden)
Mustangsart's fashion (various inc innocent world & juillet et justine)

Second Hand:
Closet Child (2nd hand) - shopping rules in english
Clothing Drop (2nd hand)
Fairy Angel (2nd hand) - shopping rules in english
Tokyo Alice (2nd hand)