Is it normal for my sister to walk around the house in her panties?

Anonymous
Recently my sister started walking around the house in her panties. Thankfully not all the time, mostly in the morning when waking up and at night before going to bed. She always has a shirt on but the shirts are just regular shirts not like those long night shirts or whatever they are called. I've told her it makes me uncomfortable but she told me it's just like if she was wearing bikini bottoms. But to me its different. My mom doesn't seem to see it as a big deal either, so am i over reacting?
Is it normal for my sister to walk around the house in her panties?
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