Just wanted to thank everyone for their advice, especially Jim65 (who fielded a few PM's from me).
After doing much research, and looking at a variety of options, I had a brainstorm...call the HOF! Several years ago I had the great honor of having a piece of art that my dad created unanimously selected to become part of the HOF's art collection (donations to the Hall have to be voted on by a committee). During that process I spoke with the Official Librarian of the Hall several times. Well, it dawned on me to call him and ask what THEY use to safely archive their uniforms. He was very generous with his info, and I immediately ordered exactly what they use!
https://www.gaylord.com/Preservation...Box/p/HYB02285