Is this a dream sign for me: People showing or talking about Underwear?

In a handful of my dreams, people have said they will "take underwear off". "want to see what kind of underwear i'm wearing", etc

I wonder if this can be a dreamsign because in reality people don't just talk or show their underwear, so i would recognize it is a dream.

Lol, that's an interesting dreamsign. But yes, it can be.
Remember that lucidity is caused by awareness, though, not dream signs by themselves. It's best to work on awareness whenever you can, instead of just when you see a dream sign. :)