net-a-porter.com
Has Roland Mouret, Missoni, Narciso Rodriguez, Chloe (official site), Luella, Marc Jacobs, Roberto Cavalli, Jill Stuart, Viktor & Rolf, Emilio Pucci, Rick Owens, etc.
Great e-zine too.
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luisaviaroma.com
Lanvin, John Galliano, Comme des Garcon, Dolce & Gabbana, Alessandro Dell'Acqua, Jean Paul Gaultier, Alexander McQueen, etc.
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aloharag.com
Balenciaga, Comme des Garcon, Junya Watanbe, Ann Demeulemeester, D Squared, Rogan, etc.
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eluxury.com
Dior, Fendi, Derek Lam, Peter Som, Nina Ricca, etc.
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letrainbleu.com
(think Barneys Co-op but more girly-romantic) Development, Erotokritos, Abaeté, Mint, Grey Ant