EPISODE I: THE PHANTOM MENACE
The entire uniform seems to have been custom made by costume designer Trisha Biggar and her staff.
Clips are worn on the belt that a "knob" on miscellaneous props slide into such as the Naboo Blaster I and the comlinks worn by the Naboo Security Officers. By design, the props remain free to pivot within the clips and are released simply by pressing the two arms on either side of the clip. These clips are from Covertec a European manufacturer of protective cases for PDAs, HPCs, mini-notebooks and cellular phones as can be seen in the photos below.
Covertec Belt Clip
Covertec Cobra PDA Case and Clip
Naboo Blaster I