Lolita at weddings: How not to attract attention with my outfit

[noxiousgem.livejournal.com]

Heya everyone! I'll be attending a wedding in June and I was told that I was not allowed to come in lolita. I have to wear something casual formal. Well I dont want to go and waist my money on something formal that I will never wear again. I still want to wear lolita but more downtoned. As the person getting married has only ever seen me in my OTT outfits and thinks all lolita is like this. She's afaid I'll be stealing the show from her:P I've decided on wearing just one colour and no prints or polka dots as I'm afraid it will attract too much attention. Im not sure if I should wear a petticoatagain because of the attention thing but the dress will look off without one. Any tipps? Or would it be wise not to wear lolita at all? Any style outfit tips?