While co-star Christina Hendricks has spoken about the 'authentic and meticulous' underwear selection on hand on set that has help her perfect her Joan Holloway wiggle, Jon is thought to be not a fan of the accoutrements.
In fact, earlier this year there were rumours that the star preferred to go 'commando' underneath his costumes.
The tall dark and handsome star had apparently been at the centre of a few awkward wardrobe moments on set, causing quite the stir among staff with his rather impressive anatomy.
The New York Daily News reported that during filming of the sixth season of the show, Jon was 'politely instructed by a staffer at the [AMC] network to please wear underwear while shooting his scenes.'
The source added: 'This season takes place in the 1960s, where the pants are very tight and leave little to the imagination. Jon’s impressive anatomy is so distracting that they politely insisted on underwear.'
Apparently, he also caused a stir while filming the show in Hawaii where he sported 'tiny shorts' for several scenes.
'His privates are the inside joke,' the source added. [Hamm] 'knows what he’s got.'
Addressing the frenzy over his body for the April issue of Rolling Stone, Jon said he was fed up with people obsessing over his manhood.
'They're called "privates" for a reason,' he said in the article.
'I'm wearing pants, for f***'s sake. Lay off. I mean, it's not like I'm a f***ing lead miner. There are harder jobs in the world.
'But when people feel the freedom to create Tumblr accounts about my c***, I feel like that wasn't part of the deal...But whatever. I guess it's better than being called out for the opposite.'
The Bridesmaids hunk continued: 'Most of it's tongue-in-cheek, but it is a little rude. It just speaks to a broader freedom that people feel like they have - a prurience.'
According to TMZ, Fruit of the Loom and Jockey both reached out to Jon earlier this year to offer the well-endowed actor 'free underwear for life.'
'Jockey would like to offer our support for Jon Hamm in the form of a lifetime supply of Jockey underwear,' a Jockey rep told the website.
And The Fruit of the Loom rep echoed the sentiment: 'We want people to be themselves. And if going commando makes you happy, we say go for it. But in case you change your mind, we got you covered.'
He keeps doing that on purpose. He's going commando, cause he doesn't want them to the mark of his speedo on his trousers, but you can see his dick everytime.
