For anyone who uses a handheld scanner whilst walking around, but wishes to be discrete (that would be most of us), I can recommend the Pentagon Artaxes jacket, which is able to hold a scanner (e.g Uniden BC3500XLT or UBC125XLT) or walkie-talkie (complete with typical rubber antenna) such that it can be taken out relatively easily - due to tall pockets with a long zip.
It has an internal access hole in the right pocket which allows you to feed a headphone cable up inside the jacket so that it doesn't get snagged easily.
A well made jacket with lots of attention to detail (I'd worn it 4 times before I found the internal iphone-sized pockets that are barely mentioned in the write up!)
Available here for example:
(First link has a better size guide)
* http://www.uktactical.com/p-11523-penta ... -grey.aspx
* http://www.military1st.co.uk/military1s ... ry=artaxes