Honestly, stay away from Milanoo, they're generally shit and there's a lot of horror stories out there about them. YourCosplay I've never heard about so I'd be vary about them.
I've heard really mixed things about HelloCosplay so I'm not sure I'd personally feel safe ordering from them either.
I can say though that CosplaySky carries the costume you're looking for and I've personally dealt with them and been quite pleased with their quality; my brother has also ordered from them and has been happy as well. Here's the link: http://au.cosplaysky.com/durarara-iz...y-costume.html
But if you just want the coat I'd reaaaaally recommend you to buy it from Cospicky instead. I've bought a costume from them and it was exactly
like the stock photo, to the smallest detail! Here's a link to the Izaya coat: http://www.cospicky.com/products/s-x...7105&lnkhr=AGm
Oops, noticed the thread is several years old. Oh well, maybe someone else is looking for the same thing.