First off you should wear whatever you want. One thing I noticed about weddings is that no one matches and pretty much no one cares so go with what you got.
On a side note to that if you are looking for a complimentary color to the red top for a wrap or shawl you have several choices. You could go with a red shawl of the same hue (I think that's the word I want) but different shade (ie: a dark red shawl with your bright red top). Or you could go with a wrap of it's opposing color (though this will look bright and in this case a little christmassy)- green. Or you could go with a wrap that is of a color next to red like purple, yellow, or orange. Yay theater.