dressing my (female) OH for a wedding

[Blueuggboots]

My lovely OH hates shopping. Hates dresses, girly clothes etc etc. Lives in jeans, t-shirts and shirts.
We have a wedding abroad in July and she's already quietly stressing about what to wear.
Her default setting for smart occasions is black trousers or suit and a white shirt.
She's tall, big boobs, size 16-18, curvy, but hates her tummy.
Can you help me come up with a stylish outfit that isn't a dress or skirt that is suitable for a warm (HOT?) climate please? She is brunette and looks great in bright colours.
I'm thinking wide leg trousers with a camisole and a patterned shirt over the top like a jacket? ALL ideas and links most gratefully received!!!
Shoe ideas too! She lives in Converse or trainer or wears plain black boots.

Monsoon have really dressy, pretty and flattering shirts

eu.monsoon.co.uk/view/product/eu_catalog/mon_26.2/5230424608

This is one example but lots of options on the website ( they come up big so could need a 14)

What will you be wearing, Blue? Not Ugg boots, I hope
Do you want her to wear something "compatible", so you look like a couple? Or do you prefer to express your own individual styles?

Gap - stripe skinny mini skimmer khakis - a white and cream narrow striped trousers. Stop at ankle/ just above so fine with mocassions/ flats. Size uk2- uk 24, plus regular/ tall/ petite -£34.95

Gap - fitted boyfriend linen shirt - light blue. Various sizes

Gap - perforated ballet flats - navy or the egg shell blue/green colour or the gold leather loafers

Gap - metallic fedora

All from gap :)

Try and persuade to maybe wear a necklace as will instantly 'glam' up outfit and at least manicure nails so tidy.

I'm wearing a 50's style blue polka for dress or a wiggle dress. Haven't decided yet.

Sounds lovely, Blue! So how about a loose cotton shirt, in a complementary fabric, with some pale slim-leg trousers? A shirt would be cooler than a cami/jacket combo.
(By complementary, I mean the same depth of colour, but maybe red instead of blue, for example)

Something like this with light trousers?

Alternatively, I know you said colourful but this sort of thing might be more in her comfort zone: chiffon shirt and trousers, with a camisole.