I think a leather dress sporran with a chrome cantle would look good with formal and semi-formal attire. I am going to buy one in the near future.

Here are some nice ones:
http://scottishkilts.net/store/leath...s_sporran.html

Celtic Croft sells an economy version for $45:
http://www.kilts-n-stuff.com/Highlan...s_economy.html