Do I think you should wear a purple (ahem, lavender) necktie for your wedding? Absolutely. I can't tell you how many times I have worn my lavender color necktie to work and received compliments.
A lavender wedding color scheme is quite popular. I just Googled 'lavender wedding' and there are almost 15 million results. Surely you want to fit into your bride's lavender wedding theme, don't you? I hear you answering, "Yes I do, but don't call me Shirley."