Yeossal and Collaro make good quality stuff. I'd suggest you check them out. They don't offer CMT to my knowledge so you can't supply your own fabric. They have a solid fabric offering, albeit it isn't crazy.I've purchased quite a few MTM shirts from Proper Cloth. I've also bought a few from Ratio, and investigated Luxire, but went back to Proper Cloth (I also have a local brick-and-mortar MTM source for Individualized Shirts).
I'm looking a reliable online MTM maker with quality, and preferably pricing, in the same general range as those makers (which vary quite a bit). The extra that I'm looking for is a good selection of UPF 50+ fabrics, and/or the ability to supply my own fabric. For some summer long-sleeve shirts for beach/boat/hike/BBQ/festival use. Shirts that fit properly, which I can't really get OTR.
Any ideas?