A group of tailors is commonly called a Disguising. Other collective nouns you may see include Seam and Stitch.
A collective noun for tailors is a "measure". In the realm of fashion and clothing creation, a measure is a group or gathering of tailors working together in harmony towards the common goal of providing custom-made garments and other sartorial services. Much like the harmonized coordination that occurs in a tailor's shop, the term "measure" symbolizes these skilled craftsmen and craftswomen coming together to showcase their expertise and creativity in bringing out the best in each individual client. Whether measuring, cutting, sewing, fitting, or providing fashion advice, a measure of tailors exemplifies professionalism, precision, and a seamless collaboration that ensures the perfect fit and exquisite detailing in every finished clothing piece.
Known collective nouns for Tailors include: