Snail mail was fun, especially around birthday time and Christmas. My best snail mail story is that when I was a little kid, I mailed my favourite hockey player his rookie card and a letter introducing myself and asking him if he could sign it for me. And he actually did, and mailed it back to me with his own letter. I was over the moon.
For clothing, ever since I started working from home, I pretty much just wear boxers/pajama shorts and a t-shirt. I refuse to use my camera for meetings, so it's all gravy. Being comfortable is my priority !