Wiktionary
suitless
a. Not wearing a suit.
Usage examples of "suitless".
He did so, and as terrified as he was by the thought of it opening and exposing him suitless to the world outside, he was even more frightened that it wouldn't.
Careless travellers who needed to breathe could arrive suitless in hard vacuum.
It felt raspingly unfamiliar after all the suitless months of city life.