What should I wear for my BFF’s Wedding?

My best friend since 3rd grade is finally getting
married we are nearing 40. I have no idea what to wear. I am not in the wedding
party as she has chosen her soon to be step daughters to be in the ceremony and
stand next to her but I am a matron of honor- wedding coordinator- slave girl
of sorts and will be present for set up/ rehearsal and playing hostess and
runner during the reception.

Wedding is an outside evening event in the Cali summer. The
colors are a emeraldy green and teal mix.

I would LOVE to wear the AVA dress from pinupgirlclothing: http://www.pinupgirlclothing.c.....-teal.html
but my mom completely gawked at that idea . She said I would be upstaging the
bride. She is right sort of but isn’t it a formal event? Although I would
probably never get to wear is after to often  I like the idea of it . My BFF’s Jr.
Bridesmaids are wearing  Eshakti dresses.
Simple retro-country cotton bridesmaid dresses.

I guess I am unsure of how much to dress up or how close to the wedding party I should match if at all and I want to
look good. ( Fit and flare or Sheath for my apple/ rectangle busty body? I am
thinking fit and flare. )

Thoughts?! Is this Navy too close to the wedding colors?

1- Day after Day ModCloth

2- Freesia ModCloth

3-Louisa Eshakti

4-Fit and Flare

5- Havana ( This may be too close to the wedding colors which I don't really want to do, but I like the style but it does not come in a color I like.  )

6. Are these too Matchy Matchy with an all blue dress?

8. Wedding palette ( not my choice

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