I recently attended a lab session at my university. The lab instructor was dressed professionally in a dress shirt and dress pants. But I noticed that in certain positions, due to the lighting in the room, the back of her shirt was see-through. You could see her blue bra. I was surprised by this because those clothes are professional attire. Shouldn't the manufacturer have made sure nobody can see through their professional attire?
She's a classy and stylish woman, so I don't think she did this on purpose, especially since this is her workplace. So is it likely that she had no idea this was happening, or are all women aware of this? Should I have told her about this, or is it not okay to mention it?