I need some help from you 07'ers - Tough Bridal Party situation

Hi Girls,

An 06'er here...For those of you who had their weddings-many congrats. For the upcoming weddings, good luck!

I do have a problem....and I need help! My cousin who is 1 year younger than me is engaged and asked me to be in her bridal party for her May 08 wedding. I didn't have her in my BP, but she asked me, so I accepted. She made it sound like we were going to shop for so many dresses, but when it came down to it, she basically in not so many words said this 1 dress was the dress and that was it. It was form-fitting [which I have no problem with] but it clinged all over [I'm not hevay but curvy, and short] so I think it would look better on someone that was 5'9 or 5'11 and a TWIG!, not for someone who is short & curvy. Additionally, it WAS halter but not the thicker halter strap which I feel more comofrtable in and bustier. The wost part is that - starting near the boob area, and going down to the stomach there are HOLES in the dress, bare holes, in which their putting 1 material of sheer in it, which will basically do nothing. I cannot wear a strapless bra [I always feel more comftorable with a bra than without]. So I just told her that I didn;t think she needed to rush into it and buy it 9 1/2 months before her wedding and she should look around more especially in the Fall when new styles for Spring come out. Needless to say, she said 'well I like it' with her MOH agreeing.
Then, we walk over to my car, she says hello to my DH who is waiting in the car for me, and she said to him that I was uncomfotorable in the dress & didn't like it. So saying that, she knew about my discomfort and self-consiousness and she just ignored it.
Then the following day she called me and said she bought all 4 dresses and that was it. I became a bit annoyed with her over the phone because I firmly believe that she should have brought all the girls down there to try on different styles of dresses and even so - if she would have asked me at least once- 'do u feel comfortable in this?' and also told me even if it was the dress, and thats it, she didn't have to buy it, now she expects the $ asap. How does she know that I wasn't using a credit card where I wouldn't have to worry about paying for it for 7 weeks? I mean, she knew my circumstances because I was out of work for a while, just got back, and money was tight.....I was overall very annoyed with her and I feel very uncomfortable in the dress & I really do not want to wear it!
I know when it came down o my wedding, I brought all my girls down their and made sure they felt comfortable in it, and I even had the change the skirts a couple times, but their comfort was most important to me!]

I REALLY need you're girls help!
Furthermore, this is the dress. Lastly, I don't think it's AT ALL appropriate for a wedding. It's not even considered a bridesmaids dress.

http://cgi.ebay.com/NWT-Davids-Bridal-Black-w-Silver-Beaded-Dress-Size-14_W0QQitemZ300137891538QQihZ020QQcategoryZ63861QQssPageNameZWDVWQQrdZ1QQcmdZViewItem