Rachel Antonoff Crimson Collars dress

Hello there

http://www.modcloth.com/shop/dresses/rachel-antonoff-crimson-and-co...

I love this Rachel Antonoff dress BUT its a bit on the pricey side, and I'm in the UK so the shipping/customs charges would be MEGA and I'm worried about ordering the right size. Sizing sounds a bit weird from the reviews on the site. Blah blah blah. 

I think this could be a totally achievable thing to emulate with home sewing - a perfect Make This Look project.

I've been hunting through vintage pattern wikis but not had much success.  Don't suppose any of you have stumbled across a similar pattern? Obviously the dress itself is pretty straightforward, but those collars look tricky!

Thanks in advance!