On Thingiverse: Pibow Belt Base for Raspberry Pi by pburgess:
Alternate ‘Layer 0′ for Pibow case simplifies wearable Raspberry Pi projects.
REQUIRES PIBOW CASE – this is ONLY a replacement bottom layer. Laser cut from 3mm (1/8″) acrylic.
The belt is made from 1.5″ nylon webbing (better-equipped hardware, sewing or camping stores will stock this and related fittings), but it’s also perfectly suited to most camera straps if you have a DSLR + Raspberry Pi project in mind. The USB battery pack is an item from the Adafruit shop, held in place with cable ties.