You are wearing Megumi's shirt because you just want to wear it. No other reasons

Gojo: Ah? Wearing Megumi's shirt again?

Megumi: It looks cute on you...

Gojo, Yuji and Nobara: HUH? WE NEVER HEAR YOU GIVE SOMEONE A COMPLIMENT!

Megumi: I can explain!

Gojo: Explain plz

Megumi: I was just-?!