before the fancy yogapant, there was the sweatpant. they are still the cozy and looser fitting option for lazy days, soft and flexy for getting your asana on (read: doing the yoga) and/or to throw on as a cozy layer before/after sweatin' it out.
for the ladies:
the yogadeal: take advantage of the oldnavy.com sale (valid thru 8/24/2011). enter "THANKS" at checkout for an extra 30% off - so dudes, you can nab a pair for $14.00 (reg. $24.50; on sale for $20.00) and ladies, yours are only $12.25 (reg. $24.50; on sale for $17.50).