Except not. The hypospray is necessarily a high pressure device: it can penetrate skin, after all. And skin is a perfectly good spacesuit as long as one doesn't mind eventual necrosis; a suit with the pressure-resistant qualities of human skin would probably be pretty close to ideal. By the same token, a determined space cloud could well make its way into an airtight spacecraft as in "Obsession". Just as Futurama put it: Timo Saloniemi
I like the TWOK uniforms with the convenient carry handle. Just incase you've got a nob like Chekov on the landing party and you need to drag him away from a girl.