I have now finished my fabulous Kaylee costume!
I am very please with the distressing and ageing, it took a while to get the oil stains right. My husband dryly commented "why don't you just use engine oil?" Well that might have been a good idea but by then I had spent a long time mixing wd40, vegetable oil and dye to try and make it greasy and permanent, so I had to see it through to the end.
A lot of fine detail has gone into this costume, I hand stitched the patches with 
embroiders thread and put dirty wear marks on the pockets and high use areas, ie knees and bum :) I have seen several other bear overall cosplays but modest though I am mine is by far the best! There are 2 things I am not 100% happy about but they barely shadow how please I am with the overall result : D
I also made a little bag from some left over materials, its not that large but just big enough to hold my purse, phone, keys and con badge etc.
I hope you enjoy the photos taken by my good friend Mr Abe, he came down especially before I get too big to fit in them any more! I am thinking I might still wear this costume over the summer, I could just leave the top half of overalls around my waist but that would only be funny with my baby daddy dressed as Simon to tag along. Lets see if we can convince him!