I think the whole concept of gendered clothing is absurd. Clothes don't have genders. People should wear whatever they are most comfortable and confident in. It's all fabric.
I'm a guy, and I while I like wearing panties, boxers are really good in the summer, because they prevent my legs from rubbing up against each other.
I wear men's boxers in bed but that's about as far as it goes these days...actually wearing some right now as I type this! I do remember a number of times when I was in a straight relationship where I used to wear my other half's boxers day to day - they were just so much comfier. People should wear whatever they want to, regardless of their sexual orientation.
I wear boxers that are actually for women, but they're called boyshorts. It's recent, I got my first pairs a few months ago. I don't really like them because...well, tmi. But I spent the money, so I try to wear them. Thinking about liking women in boxers or not, I just feel like it's picky to think about out of context. I mean, I tend to think most lesbians who wear them are andro or masculine, and that's what matters.
A few 15 years ago or more, I went to a Gay Rodeo with my BF and another gay friend. I asked my partner, what's up with all the 15 year old boys running around in boxer shorts? My partner is like... Dan, those are Lesbians. I'm like Oh.
They had T-shirts and boxers. Have to go to the Pride Parade to see topless w/ pasties made from duct tape of otherwise.