a room, as in a clothing store, where garments are tried on and measurements taken for alterations or other changes.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for fitting room
While Lloyd was still waiting for her waist, Maud sauntered out of the fitting-room, and asked permission to use the telephone.The Little Colonel's Christmas Vacation|Annie Fellows Johnston
But here there was no reception-room, no parlor, no fitting-room, no boy in buttons.A Pasteboard Crown|Clara Morris