The phrase "to fit the sheet" means to make something match or align with a particular plan, expectation, or requirement.
Sentences with «to fit the sheet»
With fitted sheets in a variety of exciting prints, you won't ever feel like you're settling when you choose these crib separates for the nursery. (potterybarnkids.com)
The cotton crib fitted sheet features a fun coordinating print. (potterybarnkids.com)
It consists of heavy - duty mattress with fitted sheets and about 1 inch thick. (newbornbabyzone.com)