Can't say I've ever seen a denim jacket with a denim kilt, but in my own opinion having seen denim jeans and jackets together it looks fine if the colors are in contrast, that is, one is much darker than the other. If they are close in color it just looks like a match was attempted but failed. Coming from different sources the color and weave can never be exact; even if it starts that way they will wear and wash differently. Actually I don't think you would even want them to match--think of a tartan kilt with a tartan jacket. Even if they did match--ugh!