LOL! I totally relate!
my husband is always so much smaller/leaner than i am. He is a muscular, lean guy. With our different body types, i don't expect to ever be as lean as him. I may never again weigh less than him either. but i can, finally wear pants that are his, but too big in the waist, for him. that's a cool feeling
i used to 'borrow' his clothes when we were dating, but haven't been able to since, till now. although, now i realize i will probably get rid of any extra pants of his, and instead wear my own bootleg style women's jeans/pants. so much more flattering and comfortable.