Rant About Bridesmaids and Desperately Needing Advice

I'm gonna to make this as short as possible. I'm getting married August 11th of this year. I have 4 bridesmaids. 1 is my childhood best friend, 1 is my cousin and 2 are close relatives of my fiancee's.( sister and cousin). I give everyone a choice from a collection I picked from David's bridal all dressed were the same from waist down just had variations of straps/sleeves. my best friend and my cousin choose the same dress (#3) which I was fine with but that ment my other 2 girls both had to pick the same( either a different dress or same as my best friend and cousin). They both had eventually decided on dress #1. So i headed out to the car with my son because was getting crabby i asked everyone to meet me at my car so we could talk before we all left. my best friend and my cousin came out first from ordering and paying they other 2 girls were taking longer. I guess while in line my fiancee's cousin had been messaging her friend that who had a wedding of supposly same color asking to borrow dresses for her self and my fiancee's sister (dress #2). which I think clash with dress #3 my best friend and cousin have ordered.i dont like dress #2 and my fiancee's cousin has argued with me that it will look fine and I'm overthinking it and kinda being a bitch about it. I feel like they are in the wrong for being so set on borrowing a dress that isn't not from David's so we dont know if that color will match and for changing there mind after everyone already decided and after I went outside. she never even asked me if I was okay with it. someone please give me some advice? am I in the wrong? thank you for reading