Am I wrong for feeling upset about this?

My older brother is getting married and my sister and I are going to be bridesmaids. My brothers fiancé said we could choose our own dresses but my older sister told me I should send her photos of the dresses I like (she thinks I have a ‘unique’ style). I’m upset about this because I feel like she’s trying to control what I wear when I’m a grown woman who is fully capable of making my own decisions and dressing myself. Am I wrong to feel this way?

Am I wrong for feeling upset about this?
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