Ooooh -yes, I agree soups - the blue looks lovely on you. The neckline is really nice. And also the ombre t I love -its a really nice shape - and colour of course!! I agree the green one is probably my least favourite in terms of shape, though the colour is really nice. Have you tried the linen jumper in the same colour? Being linen it may hang a bit better (though it is still short-ish)?
cherries - yy I agree, don't give up on the dress! It is looooovely. I think the snake sandals laska suggested would really work assuming they are comfy. In fact, I think any of the light-coloured or textured/ animal sandals linked would be good, or even those fit flop trainers...as they are a lighter colour I think it kind of takes away from some of the "clumpiness" that i think you are worried about. If you google image search "trainers with midi dress" there are loads of looks with (generally white/ pale) trainers that look lovely, and totally suitable - and make floaty dresses a bit more edgy if you see what you mean. Like this or this or these - though more casual generally.
There are also a few trainers on the new balance website that could work (though I think you'd need some with the "N" not being so obvious personally! - something like these? Or these which I think are gorgeous? ). In fact, I've just noticed you can customise your own, if you have a spare £200
. Also, I think I'v fallen in love with these Cath Kidston ones which wouldn't work for your dress, but I think are lovely 