This idea, sent by another parent, is what our son uses when he wears his body speech processor. I'll put up her version instead of mine because she has the added hint of adding bubble wrap to protect the processor during sports. The one we got has a zipper which opens from either direction instead of a flap. We bought hip a waist pack that actually is made for carrying a cassette player. The pouch is big enough that we wrap some 'bubble wrap' around the processor and then Velcro the flap shut.
Some folks just slip it in their pants pocket.
When someone on CI-Circle was looking for ideas because for when she would be wearing a very tight fitting formal dress, some ideas presented to her included wearing it in a fancy purse, and sewing a pocket into a fancy shawl or scarf. I think the most creative idea presented was to use surgical tape and taping it to her inner leg, then use a 100 cm cable. I have been able to wear pre-CI clothes that have been in the back of my closet for a year. Now I have made several for his classmates that are pink with flowers etc. Come see us at BionicWear .