i'm 5'5 and it doesn't work on me.. if you get the opportunity to customize a flap.. you can get the m/l with an extended chain on it.. and then you'd be able to wear it messenger style
yeah karman's pretty much correct... you basically get sent an invitation in the mail.. i just did it earlier this month at the san francisco store.. and it's the 3rd time the company's done it.. the other two were in NYC and Tokyo. it was only m/l and jumbos in lambskin only.. but you can opt to extend the chain length on both the m/l and jumbo.. although i'm not really sure who would get it extended on a jumbo.. you'd have to be seriously crazy tall to need a jumbo extended haha.
i didn't alter anything per say.. i decided on a jumbo lambskin and i got to pick my colors.. so i picked a light metallic gold champagny color w/ lt. ghw.... although if i had gotten it in a m/l i would have opted to have a longer chain.