To elaborate more on Yesstyle, I also have made a purchase from the site. It took about a week to arrive which wasn't too bad, however when I received it, the quality overall wasn't as great as I had expected. The buttons on the cropped peacoat were extremely loose and eventually 2 of the 5 buttons fell off and had to be sewn back on. Also the stitching was poorly done on the sleeve area.
I can't really say much about the quality of other items on that site since I only purchased one item at the time. However, as many have already mentioned the site does carry some appealing items but I would strongly suggest doing some research before you jump in and purchase something.
Quality as mentioned wasn't great so take that into consideration.
As for other great online shopping sites I recommend:
Zozo.jp ( Great site from Japan, abundance of clothes to choose from. Brands from A.P.C. to April 77, etc. Only issue is that you need a japanese proxy to ship the items for you)
9/10
Gravitypope.com ( Solid selection of men's and women's shoes from a variety of different brand names)
8/10
http://www.shopfatal.com/ ( I have yet to really dig deep into the selection, however great brands from Bernard Willhelm, Henrik vibskov, etc)
9/10
Not sure if these were already mentioned but whatever lol:
www.Oki-ni.com
www.Yoox.com
www.Thecorner.com
www.Oaknyc.com
www.Sevennewyork.com
http://azitastore.com/home.html