If you dream of being in your underwear, especially in a public place, it means you are nervous about being vulnerable to others. You might be “caught out” in an embarrassing situation.

To see someone else wearing nothing but their underwear means that you will catch a friend or family member in an embarrassing position, that will be hard to explain away.

To dream that you are wearing a boy’s underwear, represents your anxieties about whether you are “well-suited” to a particular boy in real life.