Marilyn, Maxwell, and (barely) Marceline’s suits are slim enough so humans can wear them and perform in the suits if the androids are out of commission (or if they were wearing them for fun). Though the heads were risky because of the wires that connect to their cheeks to make them glow, they were still wearable. Springlocks are completely non existent in this universe, so it’s okay to wear them. It’s only a little dangerous because of the heads. Though they would be pretty hard to breathe in (unless you’re a mouth breather).