Varying from super-casual, through summery, to really smart, it's often hard to get it right. Personally I'm not a 'wedding wear type of person'. I find it difficult to find balance between: not too much party-like, interesting, chic and cool/fashionable. Comfort is also hugely important to me as weddings do tend to be long and usually start with huge dinners which doesn't help!
Below is an outfit that I wore recently and I was very happy with. I got a few compliments from strangers which was really nice (let's be honest: all your friends and family have to say how great you look, random people don't). The pics were actually taken for myself to see if I'll go for it so I want to reassure you: hair, makeup and tan were looked after on the actual day of the wedding ;)
Dress - Orla Kiely
(belt replaced with a ribbon)
Heels - Marks & Spencer
Bag - Accessorize
Fascinator - ebay.ie
Bracelet - River Island necklace worn as a bracelet