This might be slightly off topic, but as someone who is known to like clothing and outerwear with lots of pockets, here are my experiences from this season:
Whenever we were doing serious woodworking like building the defenses and field objects, I wore Carhartt overalls. They have lots of pockets and are super durable, so they are great when building stuff. For the rest of the season, I just wore whatever clothes I wore to school that day. After the season, I picked up one of these
Mechanix Wear Aprons. I really like it, and it is great for keeping grease, metal shavings, etc. off your clothes. It also has huge pockets for storing pretty much anything.
As far as at events, I find myself stuffing my pockets with whatever I need. This season it typically included: grease, rags, zip-ties, my Leatherman (either a
Crunch or
Wingman), flashlight, and other random stuff. As having all this stuff in my pockets sucked, I have one of
these bags (this particular one isn't availible but 5.11 still sells it in other colors) that I might try for holding everything. While it might look a little silly (my friends and I call it a tactical purse), it has more space to store things. If you are looking for something to hold what you need at a competition, I would probably go with that, as it's small enough to not be a nuisance but big enough to carry everything.