• a rack of clothes

• a bundle of clothes

• a closet of clothes

• a "Trunk of Turtlenecks"

• a "Dresser of Dresses"

• a "Suitcase of Shirts"

• a "Sack of Socks"

• a "Museum of Muffs"

• a "Trunk of T-Shirts"

• a "Duffle of Dungarees"

A collective noun is the one that is used to point out a group of things or people as a whole.

For instance, herd, crowd, words of the group, bouquet are the common words that fall under the category of Collective noun.