There are a few reliable high street brands doing this trend very well. My first buy in was via Eloquii and it cost me next to nothing. The dress comes in all sizes - no really, all the way up to a 24 - and it looks like everything you're seeing with three figures on the price tag.
Keep an eye out, as I'm on the hunt and I'll be sharing my finds as the summer rolls on!
Photos by the very talented Terence Webb.