My all time favourite online shop is Revolve.com ( right here) and if you haven't heard of it before, you're welcome!!
They have the most amazing brands and some really cool styles, i could seriously spend all my money on their site.
This shirt is so so so amazing. There's a zipper on the back that connects the shirt with the choker so its basically a build in choker. The fabric is so amazing, it kinda tightens in your stomach and sets your boobs right where you want them. WIN
Do yourself a favour and check out the site - you won't regret it!