Fairly easy to accomplish after a knockout but possible during a grapple.
A scrap 'n' sew kit is best contained in a metal tin, usually Altoids or Sucrets.
"Bonus points" may be awarded for repairing any clothing damaged during the fight.
Other dude: Remember that poofta that I was pissed at for winking at my girlfriend on facebook?
Dude: Not really.
Other dude: Well, I remixed one of his soundclick songs so it sounded like he was rapping about loving dick and put it on the fakebook I made with his name. I guess he overheard me telling people about it after the bar last night so he sucker-punched me in the alley by my house. Buddy went down with one to the chin. I wasn't satisfied so I gave him the old scrap'n'sew.
Other dude: I happened to have a sewing kit in my pocket so I stitched up his shirt to make it a few sizes smaller. Then I got the idea to attach his shirt to his underwear so he'd have a nasty wedgie. You shoulda seen him trying to walk home when he woke up.