Walks around in dress (astronaut’s dress) (9)
I believe the answer is:
spacesuit
But I can't explain it at all! Could you help me understand?
(Other definitions for spacesuit that I've seen before include "satellite outfit?" , "Bulky clothing" , "- "heavenly" outfit here?" , "out-of- this-world costume?" , "Sealed garment worn by an astronaut" .)