Briefly describe this fundraising event:
For $1 on a designated day children can wear a T-shirt, jersey, etc... of their favorite sports team.

Organizing the event:
Make and post signs about the fundraiser and assign people to collect the money from each classroom.

Capital possibilities:
Depending on the school size, quite a bit of money can be collected.

Degree of difficulty:
Zero

Other suggestions or comments:
I've seen schools make $500 to $600 in two weeks on this fundraiser. Some of the schools would run this fundraiser once a week (usually on Fridays) during football season (from the first pro game of the season thru the Super Bowl).