Long ago, I learned that anything below 50 degrees feels "unbelievably" cold if you are standing or sitting in one place.
I was wearing tee-shirt, ordinary shirt, sweatshirt, and wool "Old Senators" jersey. Usually too hot for the Old Senators wool, and it felt warm before the game. (And delighted to meet CALSGR8, TomTerp, and Powerboater!). By the 7th inning I was looking to buy an extra sweatshirt, but the two or three at the mini-team store (near Blue Smoke) were about $80. Put on a thin raincoat I'd worn down to catch the bus from NYC (it was raining here). Zipped up, buttoned up, but shivering. Weather forecast was for a low of about 45, but I never guessed we would be watching baseball that late.