Clothes and footwear made for intentional purposes such as steel toe work boots or wicking shirts.
I think of technical clothing to wear for work.
Construction/yard work. This term always makes me think of non-technical outdoor brands like Timbeland or Carhartts, etc.
Wear that pertains to those who work in the elements, literally.
Rugged toes, knees, rip-stop
Clothing that has cooling technology and uv protection.
Athletic apparel that is work appropriate.
Durable, practical, able to get dirty and wear forever without wearing out.
Comfortable clothes you can wear every day and last.
Clothes that you can wear to work, but are comfortable to just wear.
Business casual - cotton polos and khakis
For work workwear means business casual clothes. It Is also for exercise hiking, boating, fishing etc.
Workwear to me includes many of the shirts and pants that I currently own - Patagonia and Kuhl shirts/pants that are comfortable and fashionable enough to wear in the office while bulletproof durability and wicking features allow them to work well at the campsite.
Clothes for working outside.