advice on what to wear as matron of honour/bridesmaid

[saffronwblue]

In a few months my dear cousin is marrying her (female) partner. I am very honoured to be asked to be bridesmaid- as we are all in our 50s it may be more a matron of honour. My cousin has told me to wear whatever I like, which is what she did as my bridesmaid 18 years ago.
Both brides are planning very elegant silk outfits - Nehru jackets from www.shibumistyle.com/en/
I want to wear something which does not clash- one bride is in hot pink, the other in turquoise. I want to look nice (obviously) and am thinking of a dress. Would navy go with the brides' colours? What would look nice on my apple shape size 18 body? The wedding is in NZ in spring so may be quite cool. I have started looking and have landed in mother of the bride territory. Budget around (150 sterling) $300.
Any suggestions on colour and or style gratefully received.

[saffronwblue]

Bump?

[Gruach]

Oh, those jackets are rather splendid.

Would it not be possible for you to pick something simpler from the same designer? Or even one of the shawls to wear with a plain dress.

[Laquila]

I think navy would be gorgeous with hot pink and turquoise. Or maybe a darkish cream? Very sweet of them to tell you to wear whatever you like but also feels like a massive responsibility!

[CMOTDibbler]

Navy would look good with their colours - do you normally wear dresses? A shift dress and devore jackety thing might work on you

If theres a big department store you can get to, then look to see if they have a personal shopper service. They are great for trying different things on that you might not have considered otherwise

[Laquila]

Do you like anything here?:

m.johnlewis.com/mt/www.johnlewis.com/browse/gifts/wedding/wedding-clothing/mother-of-the-bride/_/N-5pne#page_loaded

[saffronwblue]

I quite like this one but fear I will look like an old lady who is tubeshaped.
m.johnlewis.com/mt/www.johnlewis.com/gina-bacconi-fine-cornelli-floral-net-jacket/p2529540?colour=Navy&un_jtt_v_pdp=yes&un_jtt_v_from_product=un_product_18#page_loaded

What is good for apple shaped? The brides are going to be so smart and tailored I don't want to look like a frump. I think they would be a bit disconcerted if I ordered something from the same place as them, as it is a special thing they are doing together IYSWIM.