Toddler doesn’t feel pretty

Not sure if it’s just a phase but my LO is 3 and just the other day she says she’s not pretty because she’s not wearing a dress.

She loves dresses but we do switch to pants for the sake of being diverse and comfort for certain activities. We shower her with love everyday, we compliment her daily on her abilities, skills and of course appearance. Not sure where she got that idea from. Is this something to worry about?