Wow, this story line brings back memories. When I was a kid, my buddy and I were swimming. Our moms joined us but his mother did not have a bathing suit so she just wore a t shirt over her bra. Both became transparent when soaked. I loved the show...he acted like nothing was going on. I think he was either embarrassed or he liked it.
Did she notice that her breasts were on display to everyone, including her son?