Anyone have advice on bridesmaids attire?

I am getting married in may of 2027. We booked the venue, have a date, and starting to plan. I’ve been a bridesmaid before and I hated that I had to wear a specific dress (it did not look good on me) and had to wear my hair a certain way (also didn’t look that good on me). Since then, I told myself that I want a specific color and length (long dress), but they can wear whatever style dress they want, (because not every dress looks good on everyone) and wear their hair how ever they want.

I was talking about this with some people and they told me that I need more structure and that it won’t look good/uniform. I understand it’s my wedding and I can do what I want, but am I making a mistake? I’m the first of my friends to get married so I feel lost sometimes :/