What about other clothes?
Socks are off the table—but that doesn’t mean dad doesn’t need to fill out his wardrobe! If your old man is still wandering around in the jorts he bought in ’75, it might be time to get dad some fresh new pants that were sewn together in this millennium, don’t you think? Better yet, we all know what dads love: house robes. Get papa a nice satin robe to wear when he’s smoking a pipe in front of a roaring fire and he’s sure to love you forever! Which will be reassuring, since he was probably kind of on the fence before.
When you were visiting your folks last, did you notice that one of the tooth brushes in the bathroom was a little… dated? Maybe it’s the perfect time to invest in a sick new electric tooth brush for dad! Alternatively, you might get dad a wonderful new themed towel. Those are a thing, for some reason! Surely your dad’s in love with some fandom—Star Wars, Star Trek, whatever—and boy you better believe they make a towel for it. Consumerist culture has its perks, I guess.
If daddy’s a big fan of any famous musician, you can bet there’s a really awesome biography or autobiography about them on the market. Most of these are pretty cheap, too, since nobody really wants to read them—so you can score extra points and get dad a dozen celebrity biographies! That’ll keep him busy ’til next Christmas, hopefully.
Some sort of exercise equipment
Has the old man embraced the “dad bod” just a little too much? If mom’s been griping about dad’s flab lately, there are a thousand and one home exercise machines you can pick up for your dearest dad. You might consider a few sets of free weights, though you want to be careful not to undershoot on the poundage, lest your father suspect that you think he’s a fragile old man. There are also pull-up bars if dad’s triceps are looking a little lackluster. You could also go whole hog and get him a full machine—assuming he’s got the space to store it! Look, it doesn’t really matter either way; whatever piece of exercise equipment you get for daddy is just gonna sit around gathering dust ’til he accidentally regifts it to you in like three or four years.