Two kiloliters for a jump-6 drive. The field could contain 28.5 kL, so it could be ruled that the jumper is safe from jump sickness.
One kiloliter for LHyd fuel (at x0.5 as per MegaTraveller for TL-21).
You don't need a computer if the occupant has a computer implant and a neural jack; that computer would be equivalent to a TL-16 machine! Do jump calculations in your head! In fact, just implant the computer in the suit. Take two, they're small. (If you insist on a *real* TL-21 computer from TNE, add a kiloliter.) You might be able to use an advanced hand computer, too.
Install a communicator and power source. Even with a 1000 AU radio and small anti-matter plant, this won't go over 0.021 kL. You could even throw in a radar corner-reflector to make the suit more obvious if the radio fails, as a freebie.
Life support? Use a tiny 12-hour TL-14 PLSS A -- and also a fast drug injector. Jump space is dull; using fast drug, a 168 hour jump transit seems like only 2.8 hours! Bring antidote along for use during pickup. Virtually negligible space.
Oh, the suit's occupant. Less than a workstation...say, 0.2 kL? They just need to fit inside, don't need work space
There's no maneuvering pack. Let a ship drop you off, and come get you. If you *insist* on landing, use a bigger PLSS and pick a vector that will drop you into orbit around the planet, then use a re-entry kit to land.
Hmmm. Most of the weight is in the jump drive -- as much as 4000 kg. The volume comes out somewhere under 4 kL, without computers, and the price at about a megacredit. Throw in implant computers and price shoots up at 4.5 million each. As a suit, it would be bigger and harder to move than a suit of heavy battledress. Maybe the jump-drive could be put in a "interstellar maneuvering pack" that would attach and partly envelop a vacc suit, like a re-entry kit. Put a grav unit on the jump kit so it's easier to move. May want to consider switching the jump drive to use anti-matter. This actually has some promise....