What to wear
Dark and matte for the photographer, because you appear in the tank and the fairings. For the rider, proper gear rather than a t-shirt: it…
In short: Dark and matte for the photographer, because you appear in the tank and the fairings. For the rider, proper gear rather than a t-shirt: it photographs better and it does not date the picture the way fashion does.
Colour. Dark and matte for whoever is behind the camera, because a bike's tank and fairings reflect the entire environment including the photographer.
Fabric. Proper riding gear over casual clothing: it photographs better, it suits the machine, and it does not date the picture the way fashion does.
Footwear. Boots, visible in every low-angle frame — which is most of them, since bikes are photographed from hub height.
The thing that ruins frames. A high-vis jacket anywhere in the vicinity. On curved painted metal it appears three times in a single frame.
In the bag. Two microfibre cloths, quick detailer, chain cleaner, and a black jumper to hold beside the lens as a reflection blocker on the worst panels.