I mean, it's weird to say "You got fat," but I guess that's normal-ish in modeling.
I don't have a problem with the overall idea, though. This is normal with pretty much any tailored clothing. I have to work to stay in the right body weight/shape range to ensure that my suits fit on the occasion that I wear them. For a few years I was only like 10-12 lbs (4-6 kgs) above what I am now, but several of my suits barely fit or didn't fit at all. I have pairs of dress slacks that I got then that I fit fine in but now I look like I am swimming in.