I went a bit overboard, but even though it’s still chilly in spring, just pairing a turtleneck with a blazer can make you look quite stylish!

Just pairing a turtleneck with a blazer can make you look quite stylish indeed!
That sounds like a great choice! Dressing in the coordinated outfit you described would surely make a stylish statement at any graduation or enrollment ceremony you attend. Best of luck with your outfit, and enjoy the special occasion!