Help styling a Reiss dress for a late September wedding (please!)

[moogdroog]

After my thread looking for inspiration for a family wedding and a fruitless day shopping yesterday, I've bought this dress, which I've had my eye on for a while (and blown my budget).
Can I have some help styling it? I'm 5'3", size 16 (have bought in petite), not a fan of heels, but could manage a small one. Wedding is late September, so weather is anyone's guess.
Hoping to compensate for blowing my budget by buying cheaper bits to go with, or hunting on Vinted.
Thanks in advance for any help!

There are ... six??

@moogdroog - have you found/bought anything yet?

I too think the teal Joe Brown jacket is nice - but not with your dress. It has little embroidered bits & ornate buttons, & is quite a relaxed, even slightly boho jacket. Your dress on the other hand is graphic & minimal. Buy the jacket - it's lovely - but choose another jacket for the wedding?