Help me please! I can't find a single suitable item of clothing to wear to my sister's wedding!

[CrispyNoodles]

Wedding is in August, and will be posh.
I will be wearing a hat, so need a lovely dress.
I have dark, shoulder length hair, and am a size 12.
Suit dark red and green colours.
Am 5 ft 3" tall, but will be wearing v high heels.
Monsoon had some lovely dresses, but are all sold out in my size.
Boden no good - likewise M&S.
Please help recommend some other online options, as I won't have time to go out scouring the shops.
TIA.

So you need all three yes? Hat, dress and shoes? Whats the budget?

Have you tried Phase Eight?

oooh, thank you for your replies.
Am bobbing too and fro this evening.
Budget is about £250 to include everything.

Am liking Phase Eight.
Coast is OK too.

bump

Go to a personal shopper at John Lewis, they're FAB. Tell them what you want and what your budget is and they'll find you something you feel amazing in. I went recently and would thoroughly recommend.

littlewoods dresses are nice i wore the spotty one for a wedding last weekend

Personal shopper is definitely a good idea. I found a couple of nice looking dresses at Principles, though they're copper rather than red - could be lovely (I suspect it's either love or hate, and not much in between though):
this one and this one. This looks good too.

This is pretty, so is this (though orange rather than red).

Thank you everyone.
I love the floral trim dress.
Will definitely investigate the personal shoppers at John Lewis - hadn't thought of that before.