I don't want to be as harsh, but I pretty much agree with this thread. My own mother wore a very "blah" dress to my brother's wedding - a cream-colored suit jacket over long dress. She didn't ask for my help in choosing it, so when I saw it I was pretty disappointed. She wouldn't go for spaghetti straps and cleavage, but she definitely could have picked something with a nicer color (robin's egg blue, perhaps?) and showed some life!

On the flip-side, I've also been to a wedding where the mother of the groom went all out - sparkly royal blue strapless dress with a sheer shawl. To be honest, she doesn't have the perfect body - she looks her age. But she LOVED wearing it and that, coupled with sending her only son off into marriage, made her SO happy. Some of the more conservative guests at the wedding were suprised at her choice of attire, but after seeing her work it on the dance floor, no one could say she wasn't having the time of her life.

And yes, it's your (and your groom's) wedding, but you've included all these people - parents, siblings, etc. - because they've helped form who you are, meet your perfect match, and get to this happy place. So really, it's their day too, don't you think?

P.S. - I personally think that when attendants and parents and siblings ALL coordinate their attire, they end up looking like robots. So don't worry, you're going to stand out no matter what. It's not like the guests will forget what and who they're celebrating.