A store I would avoid completely:Honestdragonchina.
Sells there producs via Ebay. Worst quality ever imaginable. They use stolen pictures and what you see is not what you get. Not even close.

To the left you'll see what i thought I ordered. And I cried when I recived the clothing on the right picture. The apron didn't even had hems and honestdragonchina answerd that with "this is for cosplay, not for allday use". Like that would matter.
I also bought a purple dress that I thought would look like a Mary Magdelene dress. It recived it red, and completely diffrent from the pic. Both dresses were ordered at the same time however the red dress had completely diffrent sizes. The waist was to small, the skirt hand no width and the bust was waaaaay too big. Honestdragonchina answered "we had to add some bust inches since you didn't". And claimed that I had not given the the right measurments to start with. Why they did that and why they didn't add those inches on the blue dress is still a mysterioum.
Honestdragonchina can't sew and they now nothing about quality. I would tell everyone to avoid this store.
A store I would be careful about:FanplusFriendSells their products via both Ebay and via a own website.
This store is quite popular. They do a lot of replicas. However I've ordered from that store several times and I always end up disapointed.
There are cheaper shops with better quality so I wouldn't spend my money here.
A petticoat that I bought was even broken to start with. And after some weeks of use it was just rags. Every hem on the petti unravel.

I also tried to buy some dresses, but the fabric is very thin and it's hard to get the right lolita shape on the skirt, so it's difficult for beginner lolitas.
F+F sewing skills are very disapinting. They're in such hurry when making the clothings they don't even see they sew outsite the fabric and you're dress will look like this:

They also send me the wrong size.
Even if you get disapointed and sad you have to stand up for yourself. If you don't see what you get you should demand your money back. Be tough! I know it's hard, you don't wanna pick a fight, but no one should pay money for something that's broken when you recieve it or is not the same as described or shown in pic.