I'd _highly_ recommend M-Tailor however as an alternative. It's not a subscription box, but the clothes are extremely well made and the "body scanning" technology actually works (especially for someone of an odd body size like myself: 6'5", 205lbs, athletic build).
Another good company, but I don't know much about other than they're based in Southeast Asia is iTailor. They'll build you -exactly- what you want, to a fault in my experience. Get measured professionally by someone with experience if you're going this route.