in human interactions, people's feelings about their friends seeing their underwear or changing clothes in front of them can vary greatly depending on cultural norms, personal boundaries, and the level of comfort within the friendship.
Some people may feel comfortable changing in front of close friends and not be embarrassed if their underwear is briefly visible. Others may feel more private about their personal space and prefer not to change in front of others, even close friends. It all comes down to individual preferences and comfort levels.
It's essential to respect personal boundaries and understand that different people have different comfort levels when it comes to privacy and intimacy. If you're uncertain about how your friend feels about such situations, it's best to communicate openly and honestly to ensure that everyone's boundaries are respected and that everyone feels comfortable in the friendship.