I dont have a blue jean bag yet, but have spent a lot of time examining this question for myself. I am no fashion maven and there are many others on this board who have much better color sense than I. However, for what its worth - and bearing in mind I am perhaps overly restrained in my fashion choices and tend not to think outside the box - I have concluded that blue jean is a so-called "pseudo neutral" - in other words, a color that acts like a neutral. Some of the best clothing colors with a blue jean bag are: khaki, stone/clay/taupes, all degrees of grey, all degrees of beige and tan, white, brown, all denims. Also works with: navy, black. ice blue, lavender. I havent investigated how it does with the "red/pink/orange" family since I dont wear those colors.