Really lovely puzzle today from Mr. Knapp. The triple stacks in the NW and SE are very strong and the vertical double-nines in the other corners are equally entertaining. CHILLAXED ( 32D: Hung around casually?) (ok, there, especially on a Saturday, we do not need the question mark) beside TESLACOIL (33D: It may cause sparks to fly) is excellent. DOYOUMIND (12D: "Excuse me?") with OHSUSANNA (13D: Classic folk number) - solid.
And in the middle we have such quality entries as FATSUITS (26A: Outfits for big parts?) (Hah!), 34A: Certain upper-growth limit (TREELINE), and BLACKEYE (43A: Boxing ring?) (Question mark also questionable there...). And running through all that are the colorful entries ZANZIBAR (23D: Island known for its spices) and NOSEGAYS (21D: Bouquets, quaintly). Even gluey fill like TERSER is elevated by a Hemingway clue.
1A: One might have black-and-white standards (PIRATESHIP) gets a solid A. Great clue, great fill.
The last thing I put in was the N of GREENALGAE (60A: Film about rock groups?) and that finished off the puzzle with yet another smile.
Outstanding Saturday. Loved it.