Store garments like formal dresses, coats, silk or leather on wooden hangers in a breathable garment bag, never in dry cleaning bags which trap chemicals and moisture, causing yellowing.

Natural fiber clothing need air circulation.  Airtight bins are great for space conservation, so if you are using them, poke holes in them.  This will avoid mold and mildew, yellowing or a musty odor.  If your clothing is shelved, cover the stack with a pillowcase to keep the dust off.