The sizing seems to be the normal from Anovos where the Large is maybe more of an XL. I bought the L mainly for display but as a costume possibility if I chose later. I'm currently wear a 46 and the vest does fit but will be a bit better after I trim back down to a 44. Have not tried the pants but got size L as well for those. I've worn size L from the Bespin Han and they fit just fine. I assume these would be similar.
They got me for a Captain Kirk Bomber Jacket and a Discovery Phaser. This especially upsets me because they said the bombers were about ship then vanished. I know ANOVOS had a warehouse within a few miles from my house -- I would love to pay them a visit.