»In which we see a stroke of genius

The Subway Knitter has a pattern for most excellent mittens, with a buttoned pocket for holding one's Charlie Card (or Metrocard, or Chicago Card, or ... wait, San Francisco's MUNI has no equivalent stored- or saved-value electronic payment system for transit ...). A beauty. In my case, the mittens would need to be attached to my jacket with elastic and alligator clips, lest I lose 'em (and the card!).
Subway Knitter: wonderful mittens! Thank you for sharing the pattern! Now I wonder about a scarf with a subway map ...!