That's a bit insulting, Petra. I am light years away from the 'elasticated trousers' set, but I did think there were one or two dresses on that site that would have been lovely for a wedding last year - one where I knew it was likely to be hot, and it was. I very rarely wear dresses but I thought I should make an effort for a daughter's wedding. Maybe you just enjoy making insulting comments - not uncommon on forums so I probably shouldn't have been surprised.
Hobbs have some nice ones and several of the high street chains have a special range probably only available in their larger shops or one line. L K Bennett, White stuff, Boden, Whistles and Laura Ashley have some special occasion things too. I bought a Hobbs one it is sleeveless but by July I shall be tanned and golf homes (who am I kidding - I loved the dress and I shall drape a pashmina over my upper arms and no-one will care anyway they will all be looking at my beautiful granddaughter and her glamorous bridesmaids).I hope you find something you love and have a lovely day.
If you don't want the trad sort of thing, just a really pretty dress that's not too short or sleeveless, I've just seen some lovely ones on the David Nieper website. .There is a gorgeous silk one I wish I could have found last year for dd's wedding, when I was desperate, and several others that would have been nearly as nice. Not cheap, but for a special occasion...