I would wear something with the ufc logo on it for example, but not sprawl b/c i don't do any grappling.
I'd wear the everlast logo, b/c I do train boxing, but not fairtex or windy, b/c i have done no kickboxing sparring.
It's a fine line, I guess. I'd feel like an idiot if I knew nothing about the sport/brand whose logo I was wearing.
Sig Credit to Toxic