Saying Something Bad

This morning while getting dressed, I handled my daughter a sweatshirt type vest to wear over her thin shirt. She has P.E. today and has complained about getting hot when they are forced inside due to the weather.  "Wear this when you are not in gym to stay warm. You can take it off during gym." The vest has a little meaning for us. It is gray, far from her favorite color, but since it was free, I took it. I then cut out flowers and hearts from a large iron-on patch. Together, we decided where the patches should go. She loves it mostly because of the special touch we added. But this morning, when I handed it to her, she frowned. "What's wrong? I thought you liked this vest?" I asked. "I do but last time I wore it, Daisy (not her real name), gave me a funny look and said 'why do you wear that?'" I then blurted out something about Daisy's looks. My daughter looked at me and I quickly left the room. "What did you say?" she said following me. "Never mind," I answered. "No, tell me," she said. I then had to tell her if she asks again, she would lose her lunch treat. I felt really bad. Have you ever done something like this? If so, what did you do about it?