Urgent Challenge: find me a dress please!

[NotAQueef]

I need a dress for saturday as am going to lunch and a cabaret/craft day and don't want to wear my usual scruffs

INFO:
I am 5ft9 (long of torso) and size 18
I want knee length (or as near as possible)
Sleeveless –or v loose sleeves (chunky of arm)and will wear long cardi anyway
Preferably no zips or buttons at the back (too annoying to try and get in/out of by yourself)
Suitable for day-evening (nothing too dressy)
Max £55 preferably less
Must be available to order online.
Colours – not too fussed but I am v pale with blonde hair and blue eyes, so black/navy/grey/burgundy/dark red would be nice. I will be wearing black tights and flats

Thanks in advance- will check in again tonight as must really do some work!

red
teal
grey
black, cobalt or orange
stripey
green or red
brown

Red
Blue or Green
navy spots
More spots

Thanks for the suggestions so far.
I like the teal and grey ones you suggested Faux
I am so fussy I think as I have in my head this miracle dress that ticks all my boxes whilst also managing to hide my heftiness

Keep 'em coming -thank you

Tesco Pinafore Vertical seams are always good for pulling things in and the pleats down from waistband may be useful. Like a shift dress but more flattering.
Similar but patterned Says prom dress but a long coloured cardi would dress this down in Lily Allen style.

Thanks silk that pinafore dress is really nice.

Think I've realised I want something more daytimey (change of brief) so I will be having a peruse of the net at lunchtime,