This is a Stunning, Vintage Nils one-piece snow suit and bib, popular in the 1980s and 90s, Size 6, These snow suits are iconic, insulated ski wear often featuring nylon shells, stirrups, and vibrant colors (iridescent, neon) or retro patterns. They are frequently used for both skiing and après-ski fashion. This outfit is pristine! I see no stains, rips, or signs of wear! I have tried to show from all angles, but if you have questions or want more pictures, please ask BEFORE bidding! Thanks.

From another site:

Apres-style snow bibs and suits combine high-performance weather protection with stylish, often retro or form-fitting designs suitable for both skiing and post-slope socializing!