For the OP... Since you already know he has a fetish for stockings and (apparently) haven't found anything else (skirts, etc), the items are probably used to satisfy his fetish. I've done the same thing - I love the look and feel of stockings and started wearing them to satisfy my own feelings. It grew on me, it may or not with him. The bigger issue is how to bring it up with him. When my then-GF found me out and confronted me, I denied it for hours (actually, probably only 5 minutes, but it felt like forever!). I'm sure he'll do the same - its embarrassing and he won't be able to explain why he likes it. So expect that, and expect him not to feel comfy discussing it with you right away. He'll need some time to process his 'outing' but will come around. When he does come around you'll probably get tired of him wanting to talk about it...
Anyway, good luck to you both.
