The Berghaus Multitool case has both a clip to attach to 1 inch wide webbing and a belt loop which would be large enough to take the belt clip shown on the Columbia trouser.

http://www.safariquip.co.uk/all-categories/rucksacks/bags-pouches/berghaus-tool-case/




The Multi tool case is shown on the left attached to the cross chest strap. Its a perfect fit for a Samsung B2710 mobile phone.

The matching Sun glasses case has the same attachment fixture called 'opti-buckle'

http://www.cotswoldoutdoor.com/index.cfm/fuseaction/products.detail/code/A1310015