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Jon Hamm has been known to run around commando on and off the set of his hit show “Mad Men”, but now the show has asked him to put on some skivvies.

Rumor has it that with the show in the 60′s and the styles turning to tighter and tighter pants Jon has been asked to make sure something is left to the imagination.  So now Jon will be wearing underwear during his scene in the new season of Mad Men.

The next season of the show premeiers April 8th on AMC.