I stumbled on to a Virginia Tech article that listed apparel deals. It's from 2018 so I searched for something newer. Below I provide some links, but I wonder if anyone can find a comprehensive analysis of apparel deals at each school and where Iowa State stacks up.
(I wasn't sure which board to post this on.)
Virginia Tech’s Nike Deal, and How it Compares
Cash Is King In Intercollegiate Apparel Agreements
Top Apparel Companies Vying for College Athletic Contracts
(I wasn't sure which board to post this on.)