These are not specific to Celtic stuff but i Like some of these bags
http://www.jastown.com/beltbag/bb-716.htm
http://www.mountaintoptradingco.com/shootingbags.asp

That second Link i may be getting one of those as they are my style brown is my base color as I don't get dressed up to much and it fits me better and i am sick of not being able to fit my hand, wallet keys inside of my sporran.