Socially alright?

I was babysitting a few days ago, and the children (ages 6 and 8) wanted to go to the beach. Thinking that we' d be okay, I only brought a couple towels to dry off with. For a few hours the children played happily in the water, but then Mother Nature had to play a trick on us. The skies darkened, the wind picked up, and it became very chilly. The six year old was there only in a pair of swim trunks, and got so cold that he got goosebumps and was shaking so bad that it looked like he was colvulsing. I couldn't give him the towels because they were all wet and cold, so I got the idea to give him my nice and dry tee shirt. I was wearing a sports bra underneath the shirt, so I thought that it would be alright to wear out in public. It wasn't overly tight or overly large, and it was only a ten minute ride home. On the way there I was stopped by a women yelling out her car window saying I was a hooker and I should be ashamed of myself. Was I in the wrong for doing what I did?