Hey, I don’t see it as that offensive a question, and I’m definitely a “would rather wear a TUX than a DRESS, PANTSUIT or ANYTHING ELSE” kind of dykey gal. Just more of a curiosity question, but said questioner has to realize his observation is due to selection bias.
Here’s the thing-- I know plenty of lesbians who wear everything from classic little black cocktail micro-dresses to elaborate ballgowns. However, unless they are making out with their partner on the middle of the floor, no one would think they are lesbian. This does bother them greatly, because sometimes it takes more than a few “I’m with HER” 's before some random clod of either gender gets the idea that she’s partnered with a woman. There is also the problem that parts of lesbian culture are so biphobic that they instantly stereotype “femme” lesbians as bisexual (I’ll spare you my “I Hate Biphobes” rant).
The other side is that most lesbians dress for comfort rather than style, and that includes everyone from the sundress crowd to the earth mother crowd to the levi’s-n-t shirt crowd. My partner, for instance, dresses like, say, the usual female Target shopper, which is comfy-femme. Given Ellen’s usual dressing style, I’d put her in the “comfy” category, and until the day tight 501’s and a raw silk blouse are considered formal wear (and I will bless, BLESS the day that it is, drool) then pantsuits it is. BTW, note that Gillian Welch’s character on the X-Files was also a pantsuit denizen, and was heterosexual. They are just a lot more comfy, and you can forego the horror that is pantyhose.
Then there is me, an N of 1, who is an out & proud lesbian transvestite with long hair. On formal days, I’ll wear suits and ties to work (much to the horror of my brethren who physically can’t stand ties the way I physically can’t stand nylons). I look fantastic in a classic tuxedo. I have a Utilikilt (which my boss argues is a skirt. Sure, a BUTCH skirt.) Casually, I prefer jeans and T-shirts or short-sleeve geek-like work shirts. My reward if I’m successful at staying a good post-bariatric surgery patient is a really nice tailored Italian suit.
However, if there is one unitary lesbian fashion sense, it is “wear comfy most of the time.” Which, I do believe, is the same fashion sense as 99% of the world.