Rad Pitt?
You got it. 
- My capris always have a spot on them.
Mar Tyler Moore
- I should star in “Cardigans for Communists.”
Red Astaire?
Unsolved as of this post:
6. I prove sharks can be excellent at standardized tests.
8. I am a skier with my own mountain.
15. I’ll be there for you, and I’m really, really strong.
19. I was a great tennis player until that dramatic explosion.
28. I’m quite diminutive, but I am still at this location, over there, and everywhere.
29. We’ll get you to the other side, but unconventionally.
31. I play versatile cultural roles, primarily for the horses and pigs.
33. I should wear a Bill the Cat shirt when I golf.
36. When it comes to diamonds, I always blow out the competition.
**38. I should star in “Cardigans for Communists.” **
I’m giving you half credit for leading me there. I believe it’s Red Rogers.
Correct!
I think she should get more than half credit for that!
I thought I had it for a second with Hilary Duff, but that doesn’t work with the rules, I think.
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I should hold my new phone a cubit from my ear.
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You could call me a golden god of the kitchen.
- Wait, wait, I need to light up this doobie.
- I went to law school with my identical cousin.
- I should hang out with #22 in a Mexican ballpark.
- You’d buy pants from me at my very own store, if you’re wise.
- I’m a baseball player who is way cooler than you are, though I hope I don’t get too popular.
- I should wear a Bill the Cat shirt when I golf. - Ack! Nicklaus
That’s it.
Oh, that makes more sense. I know Fred Astaire wore a cardigan in one or two movies, but I hadn’t heard he was famous for it.
Also, I admit I spent more than a couple of seconds trying to figure out how you got “Red” from “Ginger”…
- I went to law school with my identical cousin.
Atty. Duke?
You got it! I originally had an abbreviation in the clue to make it more fair, but you didn’t even need that.
- I play versatile cultural roles, primarily for the horses and pigs.
Stockyard Channing! Wait… different game.