If they aren't supposed to be seen, then there are lots of men sinning by wearing a white shirt to church.
She laughed and told me that the comment was made by a man who was wearing a typical white shirt - which showed much more clearly than her blouse that he was wearing the garment.
My comment about white shirts is exactly why I don't take it seriously when someone says they shouldn't be seen. I don't want to walk around showing my "underwear", so I get it - and I respect that standard greatly. however, we as a community have gone so far past that point as a culture that I just shake my head silently and go with whatever is comfortable to me personally.
Seriously, any man who wears a typical white shirt to work or church with typical garments underneath and then talks about not letting garments be seen hasn't thought very hard about it - or is unconsciously sexist in his application of that standard. Frankly, that hypocritical sexism bothers me much more than anything else about the story she told me.