Its was a reward from the Imperial Quest Park on Naboo, at the Emperor's Retreat.
LOC: 2411 -3943
You start the series of quest with Kaja Or`Zee.
The suit used to come from Captain Thrawn, however it was random, so you sometimes got the TIE Pilot Survival Suit instead.
AT-AT Helmet
http://swg.allakhazam.com/db/getitem.html?swgitem=3132
AT-AT Pilot Survival Suit
http://swg.allakhazam.com/db/getitem.html?swgitem=1986
or the
TIE Pilot Helmet
http://swg.allakhazam.com/db/getitem.html?swgitem=2057
TIE Pilot Survival Suit
http://swg.allakhazam.com/db/getitem.html?swgitem=2058
I really need to re-udate the imperial quest park once again, this is like the 4th time i've had to do it.
Guide for it:
Imperial Theme Park Walkthrough
http://swg.allakhazam.com/db/guides.html?guide=1079