How about investing in a one-piece overall Geoff? You could ditch the jacket and then work safely with the coveralls on. Plus you could then claim tax-relief for the overalls, steel-toe-cap shoes and 3-piece if it's a requirement to wear one - change at the customers expense, eh?
Seems, to me, like a trivial reason not to use your skills. Unless you like the relative freedom of contract work and staying mobile that is. Incidentally I've been wondering why you don't use your IT skills to develop some training packages and go freelance doing training and stuff?