Pond Naravit is a brand ambassador for Tommy Hilfiger (along with Phuwin, Gemini, and Forth) so I’ve only seen him in those. Obviously Rowoon did a whole series of ads for Calvin Klein. I don’t know specifically about anyone else.
Meen does a lot of modeling so he could easily be doing a brand sponsorship.
Because Calvin Klein is so popular it’s hard to know if they wear it for fashion or money—or both.