Full slips
A continuous layer
A full slip runs from the shoulders towards the hem. It can create a separate layer beneath an unlined dress, but coverage and transparency depend on the actual fabric, colour and construction.
Follow the dress, not a label
Compare the neckline, arm openings and hem of the slip with the dress you intend to wear. Adjustable straps can change the position of the neckline; check the finished fit rather than assuming one strap setting works for every outfit.
Slip or slip dress?
An underwear slip is intended as a base layer. A slip dress is designed as outerwear. Similar silhouettes do not mean they offer the same opacity, finishing or coverage. Check the maker’s description before wearing either on its own.