The wearable technology startups that get attention make products a Silicon Valley executive or journalist might use — fitness trackers, virtual-reality gaming headsets, jewelry that delivers text-message alerts. It’s lifestyle stuff. But wearable development in the near future depends on more workaday equipment.Call them work-wearables: computers worn on the body that help get the job done. Think smart glasses displays for manufacturing workers following complex assembly directions; voice-activated clip-on computers that help store clerks check inventories; or caps with sensors that make sure long-distance truckers aren’t dozing off.Google’s Project Jacquard recently acknowledged the work-wearables market with a partnership to weave conductive yarn into uniforms made by Cintas. Judging from the companies’ talk about health care, hospital scrubs seem a likely first target.As a business proposition, work-wearables offer advantages over the better-known consumer-oriented products.• Instead of defining new problems, work-wearables solve existing ones.That makes the sales pitch a lot easier. Take the caps and helmets from SmartCap Technologies, based in Brisbane, Australia.What looks like a regular trucker’s cap or safety helmet can detect when the wearer is getting drowsy, triggering a smartphone alarm or, if the danger of falling asleep is extreme, alerting a supervisor or dispatcher.