I don't know any way to describe this other than to say that it's awesome: Dick Allen Hall Of Fame combined with Buc Tracker to figure out all of the different uniform combinations that the Pirates wore in 1979 and then create a gigantic infographic, laying out each day's combination. The result is glorious.
yellow hats must be worn with black tops.
black hats must be worn with yellow tops.
pinstripes tops & bottoms must be worn with each other.
beyond that, have at it!
I remember when Dave Parker would wear the all-yellow combo. Looked like a very large and very angry canary.