It's hot right now. Hot. And sunny. Very sunny - you need sunscreen - broad spectum and plant based (I like Badger). Screw layers, it's hot. I like sweaters for indoors since AC gets cranked up high here. Bring 1 pair jeans/whatever your choice of long pant. Bring shorts if that's how you go. I look awful in shorts, so I bring skirts. If you need it, bring glide for the inside of your thighs or any "hot spots" that you might get. Bring good shoes. I made the mistake of wearing my cute wedge sandals this weekend at DTD. Stupid me.
Did I mention bring sunscreen? Cause if you don't bring anything else - BRING THAT!! Oh, and bring a hat - whatever style you like. Myself, I like broad brimmed floppy 70's awesome straw hats. If you wear a baseball style hat, please sunscreen up the back of your neck. You will thank yourself for that. Sunscreen places that everyone forgets: ears, neck (all of it) front of chest, top of feet, back of thigh and shin, hands, and back of arm. Sunscreen for babies - basically just dip them in sunscreen since they can burn so easily. Zinc sunscreen is the best, I think.
Anyway, that's what would be on my list.