Upset about dress code at work

I just got home from work. I'm really upset. Everything had gone great but then someone pulled me aside and said they had gotten some complaints about what I was wearing. I don't think what I was wearing was out of dress code. Even the person that pulled me aside said I looked cute. I don't know what I did wrong. I'm wearing a cropped sweater and trousers. You can't see my stomach. I wonder if they just have an issue with it because it's cropped. It also made me wonder if they just don't like me. I work as a sub para. All the permentant paras wear leggings and t-shirts or sweaters. Wearing that is not my thing. I feel like I dress more professional than the permanent paras. I really don't know where I went wrong and I feel so bad.