I've never owned a TapOut or Affliction shirt, I'm a horrible UFC fan.
You are lucky.
I dont think it is possible to not look like a douche wearing Tapout. I bought it before it became popular and i thought it was my "style". Then everyone started wearing it and i right away realized i need a new wardrobe because i do not want to look like that "I watch MMA!! Look at me and my muscles. Douche" guy. lol
Though i do find it hot on girls. A tight pink shirt or sweater. Girls look good in it and girls being in to MMA is hot 2 imo.