A harness will work with most life jackets, though with my ski-vest style life jackets, the vest is too long and gets in the way. Still usable, just a hassle. The harnesses are $100 each for the bucket type, but there are cheap "cloth" type on ebay and the like for $50 if you just wanted to give it a shot. The more expensive harnesses are more comfortable.
I disagree with raisehull about harness usage. I like to use mine whenever the wind is heavy enough for it, and in moderate to strong and/or gusty winds, skipper and crew are almost always on the wire. Harnesses are tricky to figure out for a beginner, as it adds another step in tacking, but with a little practice you'll get the hang of it. I didn't start using them in earnest until my second or third year sailing the boat (It took me that long to get comfortable enough sailing the boat on it's own to really make the effort to learn how to trapeze).
Personally, I think the Hobie 18 was meant to be sailed from the trapeze. Being out on the wire is MUCH more comfortable than sitting on the fiberglass deck or trampoline, gives you far superior control, a much better feel for the boat, and gives you better leverage to keep the boat down and therefore allows you to reach higher speeds. Granted, it's all about the type of sailing you want to do. If you're just looking for a leisurely sail and don't want to use them, then you probably won't. They can be a hassle, and make things a bit more of a work out. You can sail in the same winds with or without a harness, but without, you'll have to de-power the boat more, travel out more, pinch up more, and/or spill more air from your sails, sooner than you'd have to if you were double-trapped on the wire.
_________________ Mike  '79 H18 standard ' Rocketman II' sail #14921 RIP '78 H18 ( unnamed) sail #14921'08 H16 sail #114312'97 H21SC sail #238
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