Formal outfit when breast feeding - what to look for?

[SilkyBreeks]

Am expecting my first baby any day now and am planning to breast feed. I will be going to a smart wedding at the end of September, so hopefully I will still be feeding baby at the event.
I was just wondering, what kind of outfit should I look out for? I'll want something that I don't have to remove entirely to feed, and was wondering if there are certain colours/fabrics that experienced bf-ers would recommend avoiding.
(BTW I don't wear things that button up the front as I have huge norks so they just don't work, in "normal" circumstances I am definitely a dress person, quite girlie.)

Sorry for such a frivolous question, but I would really appreciate some thoughts :O

skirt & top, not dress, top must be loose enough to lift up easily and to fit over extra big breasts

probably silk is the worst for showing any leaks but you prob won't leak

Unfortunately dresses will probably need to stay in the wardrobe until after you've finished breastfeeding. Although I have seen one that has an opening at the waist. It wasn't very formal though. I broke the strap on a dress trying to breastfeed out the top. A skirt and top that doesn't wrinkle is probably best. But I'd say you'd be better to wait til closer to the time as you don't know what size you'll be!

That's ace, I think I might be able to get away without spending much! I have a brilliant printed circle skirt that was rather too big before I was pg so hopefully that should fit me by then (weight gain is virtually all bump and boob), and if I get a couple of plain drapey type tops from the supermarket that I can lift up (spare in case of leaking/sicks) and a new belt I reckon that will do nicely with best shoes/bag/jewellery
I have bought the baby an excellent outfit so hopefully that will distract from me anyway