So my girlfriend and I have recently begun discussing the topic of a wedding. I haven't proposed yet, but she knows it's coming. I've brought up my plans for being hitched in a kilt and she currently doesn't want anything to do with it. Her argument (which I find weak) is that I wear it all the time already. She thinks this would cheapen my wearing it for our wedding for some reason. I personally think this argument doesn't hold water, but I haven't figured out a polite way to tell her I think it's a load of manure and have just been saying "We'll need to talk about this more later."

Here's my question: How do I convince her that me being kilted for our wedding is a good idea? Idealy and significantly less likely, how do I make it seem like it was her idea so we all end up with smiles?

Thanks in advance.