What's your price range Lilith?
I don't know if you're based in the US, but there are a couple good US based stores that sell some good basics.
In The Starlight is currently closed, but when it opens, they have really good quality stuff and the person who runs it is awesome.
You could also try
Candy Violet, although their stuff tends to sell out.
You wanna stay away from ebay stores that claim to make replicas of brand items. Most of the time you're going to get a poorly-made items with shoddy materials.
EGL Comm Sales is the LiveJournal community where the members of the main community will sell things for often cheaper than what you can buy them new. I like going there and browsing the bargains.
Otherwise I think a lot depends on what style you prefer.
Metamorphose and
Baby the Stars Shine Bright are the 2 more popular brands that ship international. You can also find secondary sales of brand items at Marui-One.
>.> I hope that helped a little!