I believe it was THIS Recumbent forum that turned me onto the idea of picking up some cheap shorts, $9 to $13, from WalMart... then get some round elastic and slip it through the 'cuff' of the shorts.

Worked GREAT! hardest part was finding the eleasit material, but they are on their 2nd year of use right now...

Total cost per pair of shorts, with elastic and plastic clincher = Under 15$, and they have the expandable waist too!!! Talk about comfortable...

HTH...

PS - The original thread - GoatBiker had the WalMart idea...
http://www.bikeforums.net/showthread.php?t=329267