Personally, I can't carry enough clothes in just my pockets - but that's because I run pretty cold. I'll carry minimally for a good forecast:
lightest semi-rain jacket I own (unless the forecast is bad, in which case I take a more serious one)
arm warmers, leg warmers, windproof gloves, ear band, vest

if the weather is supposed to be rainy or cold, I'll bring an additional l/s jersey or base layer and possibly windfront tights, possibly toe covers.

come to think of it, if the weather is supposed to be really bad, I'll be wearing my living room.

Last time I did it, the weather was as perfect as can be, but the first descent was still insanely cold - freezing, literally. If you don't want to bring real gloves, you could bring some surgical gloves and baggies for your toes and toss them when you are done with them.

and for food, I know I'm fine with their solid food (the usual boring pastries, bananas, PB&J, fruit, nuts), I know I can't use accelerade so I'll have one or two servings of Heed, and I'll have about 4 Gu packets because that's my standard ride-food, and a few Enduralyte capsules. I won't bring any solid food.

All this stuff will fit comfortably in my little tailrider bag.