My sister walks around our house in just pantyhose and a bra is that normal?

My sister and I are really close and we have a house together since we're both single in our 20's. I posted a question on here the other day about this, but is it normal for her to just be walking around in tights. She works as a bank teller and she wears pantyhose like 24/7. She comes home from work and literally drops her dress and sits on the couch playing xbox. And she never has underwear on. She just relays on her pantyhose being darker at the top and that white thing on her crotch to keep from showing too much to me.. by the way what is that white part by her crotch for? Back to the topic its really gross and I think she does it just to piss me off. I mean I don't want your sweaty ass pantyhose on my couch not to mention I can clearly see her lady business under the pantyhose because like I said she goes to work with no underwear on just pantyhose. it really irritates me that she does this shit around me and I just basically wanted to know if its normal for girls to do this shit around there brothers at an age let alone in their 20s
My sister walks around our house in just pantyhose and a bra is that normal?
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