The phrase "completer piece" means something that brings together other parts or elements to create a whole or finished work. It is like the missing puzzle piece that makes the picture complete. Full definition
I have a fondness for jackets and cardigans as completer pieces so those are usually the first sections I head to in a thrift store. (finewhateverblog.com)
It is the perfect completer piece for so many different outfits. (puppiesandpretties.com)
Lighter weight versions of this traditionally men's wear staple make for a perfect completer piece as the weather Read More... (finewhateverblog.com)