Weddingbee boards

Hey bees!

So my wedding is less than 7 months away (ah!) and I'm trying to research what color vest/tie the groomsmen should wear.

Our colors are different shades of purple, accented with white/ivory and silver.

My FI will be wearing a black tux or suit, with a silver tie and vest (silver is our accent color, and he really wanted to wear silver)

The groomsmen will be wearing black tuxes or suits as well, but my question is, what color do you think the groommen should wear for ties/vests? Would it be weird for them to wear white, or should they wear sangria (color of the bridesmaid dresses)? I'm probably not going with them, so I wanted to give them the option of either white or the sangria/purple color of the BM dresses.. and I get a feeling they are not going to pick purple lol.

And not sure if this matters, but we're not doing boutinnieres (sp?), so they'll be wearing pocket squares in the color of the BM dresses.

Here's my inspiration board for reference:

http://www.theknot.com/inspiration-boards/Gallery/Details/87608

Thanks for any help!