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I'm lucky in that I dress however I feel for work while keeping it somewhat civilized. But I typically wear leather jacket & gloves, motorcycle boots. I typically just wear my jeans, but also use Joe Rocket overpants if/when needed. Anything else I may want to change into at work just goes in my saddlebags.
I'm also lucky in that most of my commute is done on local roads. Even Route 28 between Barnstead & Manch is pretty tame and I'm not burdened with equipment necessary for work.