embroidery hoop in a pinch?

[ithink-toomuch.livejournal.com]

i decided to embroider something on a sweatshirt, but it's taking forever because i don't have an embroidery hoop...and jersey and sweatshirt material doesn't really like to be embroidered.

any random ideas on what i could use/do until i get a hoop? i guess this question is geared toward those of you who are, like me, too lazy/forgetful to pick up one of those hoops. still trying to figure out a little makeshift crafty solution to make this go easier and faster by keeping the fabric taut.

don't worry, i checked the memories!