Congrats on being able to wear it at work! Good on ya!

I agree that you should stick to the 4 or 5 days you pick (pick 5 and try to space them out). Don't abuse the priveledge (yet).

Burns Day... January 25
St Pat's Day... March 17
Tartan Day... April 6
Christmas (last day of work before)
Company Parties
"Sinco de mayo"... May 5
All through Octoberfest... (I'll loan you the German National Tartan Kilt)

Ok... I'm getting a bit silly, but you get the idea and a few dates.