Should My Female Roommate Stop Walking Around in her Undies?

For about four years, I've had a good platonic relationship with my female roommate, with whom I share a two-bedroom apartment. Lately, a problem has arisen when my new girlfriend sleeps over. My girlfriend has an issue with the fact that my roomie often walks around the apartment in just her bra and panties, or sometimes just a long T-shirt, which can reveal a bit of bare butt. (My girlfriend refers to that as "porky pigging.) My girlfriend claims that the roommate is being disrespectful and "provocative."

It's so silly, because although my roommate is pretty, we've always just been friends. Just to keep the peace, though, I am thinking of asking her to cover up when she comes out of the room. On the other hand, I am afraid she might be offended. What should I do?

Should My Female Roommate Stop Walking Around in her Undies?
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