Thomas IV was created by Lia Cinquegrano in the Spring of 2011. She was renting a large classroom in a closed elementary school in Williamsburg Brooklyn with several fellow RISD grads and while designing women's wear full time, she began working nights on a project she could call her own. Unispired by precious and formal designer handbags covered in hardware and lacking in personality, Lia was determined to create bags that convey casual but colorful utilitarianism. All Thomas IV bags are developed and produced in New York City using unique leather and fabric combinations.

Lia's brother is Thomas Cinquegrano III so she stole Thomas IV and passed it down to her collection.