Hi Gunnar, sorry for the slow reply... I'm just back in the office after the weekend! It seems your questions have been answered in my absence, so thanks guys! (If anyone fancies a day job, we're recruiting customer service staff again at the moment...)

So basically I can just confirm what you've already been told.

(1) It's true that the 'same' tartan from different mills can sometimes look very different. But when ordering a kilt and plaid together, just specify the same fabric from the same mill and there's no problem. I'd expect our team would usually notice even were you to accidentally specify different suppliers in the same order, and ask if this is really what you wanted. But best to make sure yourself that the fabrics have the same code, just to be on the same side.

(2) I'm grateful for turpin's illustrations, which are a clearer answer than I'd have probably managed! :-)

(3) Yes, garter straps are included with the flashes.

Please PM me directly if I can help further. Or our staff are always happy to help by phone or email.