These Trailworks Bibs are made by FLYLOW, a company started by a couple of skiers in Colorado "who imagined better gear for the mountains." On their website they say, "These canvas coveralls are tough enough for trail building, planting in your community garden, or riding a rowdy downhill trail on your bike. But they’re still soft and pliable enough to move around in, thanks to a worn-in comfort. They have ample pockets for storing your tools."
A limited number are available.