In keeping with the recent trend in which I have been making active-wear, I'm about to start on a new bike jacket. I'm reusing the same pattern from which I made my current jacket, which has got to be 15 years old, at least. The pattern is the Golden Triangle Cycling Jacket from Storm Mountain Designs which I bought at the late-lamented Textile Outfitters store in Calgary.
I made my first iteration of this jacket from a synthetic known as "super microft", also sourced at Textile Outfitters. While this jacket is still very functional and not too worn out, its time is coming to an end. It lost some of its water-resistance over the years and the wash-in stuff (Nikwax) seemed to interfere with its breathing ability. The reflective tape is worn out in spots and looks quite ratty (though it's still pretty reflective).
There's a low curving hem in back to guard against gaposis.
I added reflective tape all over the place for visibility. I ride my bike to work except when there's snow and in the fall, it's really dark on my way home.
I had the forethought to purchase 3 sets of pit zips at Textile Outfitters and after 15 years have 2 left. That should be a lifetime's supply, I figure, at the rate I'm going!
My new jacket will be more substantial than this one since I'm making it from Goretex and it needs to be lined to protect the membrane. I've got some athletic mesh lining in the stash. To further increase ventilation, I'm splitting the back to create an upper back vent (sort of like the back of a trenchcoat).
To make my new jacket as safety-conscious as my old one, I'm going to use some retro-reflective plastic piping (looks clear in ordinary light) and as an accent on the back (from the stash), fabric with an overall retro-reflective print (looks boring grey in ordinary light). Flash!