So I bought a bunch of stuff from NSuited two weeks ago and was really happy with what I got. I haven't used Belvest before and was kind of hesitant about sizing, but everything lined up well given the amount of information they give for each specific item on their website. The quality is so amazing for what I paid, and really, I am excited/hopeful for what the future might bring if they can expand their selection! I'm a size 42, so as of right now there's not a ton to choose from (they have the most to offer for size 40 folks), but I ordered five items and Connor worked with me about keeping what I liked and sending back the unfavorites. Definitely give it a shot if you are even mildly interested in trying some double-breasted suits (I didn't think I would be).
I'll follow this thread for news.
Thanks Connor, Gabe, and Matt.