nope, it's near impossible for me. it's hard enough for me to find a bra that fits me, but to find underwear to match, it's never happened.
i wear the same brand/style # bra everyday and the same brand/style # of underwear everyday. but none of it matches
oops.. just remembered i have one matching set. my bf got it for me a valentines day. the bra doesn't support well enough to wear in public, so i don't ever wear it out. but i do have one set, that he ordered online.