What waistcoat to wear with Stewart Black tartan?

[t_challa]

Greeting fellow kilties,

I am on the verge of buying my third kilt. I currently wear my kilts casually in informal settings (going shopping, djing, out for a night on the town). I usually pair the kilt with a t-shirt and waistcoat, hose scrunched down with a nice pair of boots. Here's a link to a shot taken by a street photographer who liked my style:

http://www.finchleythompson.com/pers...e7a3c#h4de7a3c

Anyway, I'm having trouble figuring out what colour waistcoat to wear with Stewart Black tartan, which is what my next kilt will be. I don't want to wear a black waistcoat as I find that a bit too much black going on. And other colours don't seem to compliment it or seem to garish (ie red, yellow). The only one I've come across that could possibly work is one I recently saw in River Island of all places.

Your thoughts and opinions would be gratefully appreciated. (Please bear in mind that I'll only be wearing this kilt in casual settings, with a t-shirt, as it's quite a pleasant Summer at the moment)