How to Prevent Mold on Knitwear in Humid Summer! How do you store your knitwear during this humid summer? If you just leave them in a drawer, mold is likely to grow due to the humidity. That is why I settled on this must-have item after trying five hundred million hangers! M Boutique Knit-Specific Hangers. Even if you hang your knitwear for long-term storage, you don't have to worry about shoulder bumps, and the non-slip coating prevents them from sliding. Since the knits are well-ventilated, you don't have to worry about mold, and the chrome plating prevents rust even in humid environments. Plus, it comes with a 10-year warranty, so you don't have to worry even if it rusts or breaks down at any time!