Of them together? Hmmm.. i think Michael likes to buy "ugly" clothes for trevor just because they remind him of him. (Sometimes ugly means genuinely hideous, other times its somthing like the pussycat shirt where Michael's kinda /hoping/ he'll wear it).
I also love the idea of M hiring Trevor to do his "lifestyle guru" thing (its canon as of an online update i promise im not insane) on set to scare the actors into staying in-line.
I also think if theyre in public together theyll openly mock and bully people around them. Like singling out one person to just make snide little comments to/about until it becomes genuine harassment lmao