What a pity that they didn't use the chance to show the Doctor's question marks on his underpants. When else could there have been a chance to see him without trousers?
Picture this: Dad is in the backyard mowing and finds Bigfoot Underpants in a bush! He might be credulous at first, but what proof is there that these are NOT Bigfoot’s underpants? Well, besides the 80" waist, sensible 100% cotton material, and roomy front double flap, it also has Bigfoot’s name and picture printed on the elastic waistband. So they are FOR SURE Bigfoot’s Underpants and he’ll be on the phone to the local news before you can admit it’s all a prank. This is what Bigfoot wears when his nudity would be inappropriate.