Buying your dad a leisure suit was a thing in the seventies....but was it a good thing???
I hate buying clothes for other people. You are never sure if it is really their style and that they will really like it, and then there is the awkwardness of if they wear it or don't wear it. The only time I mess with clothes is if it is utilitarian or is super awesome like the Serenity t-shirt I bought Shannon for Christmas (Jane with his gun saying it's time for some thrilling heroics).
It was also recommended that you buy the things he wears under the leisure suits...ew!
And clock radios were a hit again, this time in many different colors and styles.
The most sensible gift of these two decades is definitely the pen. Plus it erases...I love those pens (the ones that work)!