So as the title suggests I have 3 BM's who range in size from 18-24 and all have different body shapes! One is tall so hides her shape quite well and is also the smaller out of the 3, another has massive boobs but is also quite round, i think shes an 18-20, and the last one is short and well as nasty as it sounds, shes just like a bean bag! When asked for her honest dress size she still lied and said 20 but I know shes larger than this as I borrowed a pair of leggings she recently bought when I was full term with my daughter who is now 15 weeks old and they were a size 24! If they hadn't of had a lace tie they would have fallen down on me even with my huge bump lol! Now I'm no catwalk model myself after having 3 children lol being an 16-18 myself :)
So my question remains where in the world do I get 3 dresses that we will all be happy with and for a reasonable price somewhere in the region of £60, but less if I can help it!
Some prerequisites of the dresses are as followed:

Must be a light or shiney turquoise,
Must be corseted with a lace up back (to hold in all the wobbly bits! Done the same with my dress lol),
No higher than under the knee,
Can be any dress shape apart from fishtail,
Not made of a material that is unforgiving to odd body shapes!,
No more than £100 as a max price per dress (could maybe add p+p charges on that if the dress is worth it!),
And last but not least, Not be nicer than my wedding dress lol!

Thank you for any help in advance! :)

Wow that souds amazing! Thank you :)

you should have a look at multi wrap/ infinity dresses, they suit all body types! Its what Im having.