The two had nothing to do at the moment, and Mic, in his purest moment of boredom, looks at Aizawa with an idea

Mic: Hey, Sho, what if we swap hero clothes? I wear yours and you wear mine!

Aizawa just shrugs, accepting and not caring much

After the two put on each other's clothes, Aizawa feels uncomfortable (especially the ass- 😈) pulling his pants slightly. Mic just thinks Aizawa's clothes are too loose for him