usually Feb is good for jeans and t-shirts during the day. a lightweight jacket or sweatshirt at night. of course i would probably bring one or two pair shorts in case it turns out warmer.
i live near WDW, and as you probably are aware the weather here in Florida during winter months is unpredictable when comes to temps.
i know last year a few weeks in Jan and a little Feb it was cold here at least for us floridians. wind chills got down to 25 a few days.
So unfort one day can be t-shirt/shorts time but the next sweatshirt time or jeans.
color coordinate as well. if bring shorts, match t's with those, and jeans or other long pants. that way not bringing a shirt for shorts and then for pants.
layering is good here too. that way can put on or take off what is needed each day while at the park.
and don't forget you can rent lockers for storing extra items while at parks, then retrieve them as needed. i.e. jackets,
if get here and determine you need something didn't bring, if have a car you can drive over to a
WalMart and pick that up which would be less expensive then at WDW. that also gives the option of not bringing extra clothing items for that "what if" situation.
i know i tend to pack for about every what if i can think of. hehehe. So overpacking is a major issue for me as well when traveling. LOL
see ya said staying at two resorts during your stay. if possible, of course don't know if flying or driving. another idea is to pack one or two suitcases with clothing items for one resort, then another suitcase for the other resort.
that way you only have to open and get into one suitcase, and then not having to repack everything that you brought to move over. using a separate bag for toiletries etc....
suncreen is still recommended even during winter months here, sunglasses and hat/cap.
guess in other words bring what you want, go buy what you forgot but most of all just come on and have a blast!!!!