Do the jacket and the waistcoat have to match?

[DWFII]

Have you ever seen anyone wearing an Argyll and a tartan vest?

I think I saw a photo of Matt Newsome in an Argyll and a non-matching vest.

I'm not exemplar but I don't have a matching vest (yet...I have the material) so I wear a silver grey six button waistcoat with my dark charcoal Argyll jacket. I think it looks good. You can see a photo here

And finally I believe if you look closely at the Vintage photo section you'll see several distinguished gentlemen wearing jackets with non-matching waistcoats...among them John Brown (Queen Victoria's "groom" ?) and several of Captain Alwyne Farqharson of Invergate who was captured at an event with Queen Elizabeth.