We can't match the color of the bride here, but we can't be exactly the same as the bride. Choose a lighter one.
The bridesmaid's duty is to take care of the bride's everything, hold the skirt to pull things, collect red envelopes and so on. Basically, you can't leave the bride for a day. If you don't wear a bride's dress, just be decent and don't conflict with the bride's dress and evening dress. Generally speaking, it is better to ask the bride's opinion.
My sister-in-law's maid of honor went to the bridal shop and asked, there should be a special person in charge there.