help me find an outfit for a wedding next week please!

[escape]

So, am actually able to have asocial life next Saturday as I have procured a lift to my friends wedding, thought I was unable to go due to no transport..

I have got some suitable, but old dresses to wear, but quite fancy something new...
completely uninspired tbh! Don't get chance to shop often, so have nothing in mind.

My problem is my size - 18, but my legs need covering up - very large thigh and veins from top to bottom sadly
(don't I sound delightful)
I am 5ft 8 with long brunette hair and can wear most colours.

Any suggestions ??
TIA x

What's your budget? This is nice...

Or would you do a knee length dress with opaques?

Oh lord , that is sooooo me. (thinks of how to rob bank) appreciate I won't be spending a fiver, but can't necessarilly stretch to that hmmmm (thinks of more ways)
would definitely wear something shorter as long as not 'tight' and can wear opaques yes :)

Hmm... how about this maxi or this with black opaques?

The Pearl Lowe one is lovely isn't it? what colour tights I wonder - have a mahoosive aversion to black with pale colours.
Quite excited to take a look 'round the shops now.:)
Have had the crappest year of my life and my confidence is beyond zero, I love clothes and fashion, and know how the 'right' outfit can make me feel. Also, will be seeing people not seen for years and I am about 2 stone heavier than I was then..