We're going in February this year also (to Orlando from 2/18-2/22, albeit not to WDW), and current forecasts are putting the high temperatures in the mid-high 60s and lows in the 50s -- a few degrees lower than average, and potentially quite chilly-feeling if the day is windy and/or cloudy.
Assuming that this forecast doesn't change (once we get to highs above 70, my family considers it shorts weather), my plan is to pack items that can be layered: tees with jeans or denim capris, with zip-up hoodies and fleeces (that can be tied around the waist or tossed in a lightweight backpack when not in use). We'll probably bring the swimsuits and flip-flops too, as we're content to swim in almost any temperature. OP, it looks like the projected high temps are more like mid-low 70s for your dates, in addition to some flexible layering pieces (ideally in a mix-and-match color scheme), you may want to pack some shorts, dresses or other warm-weather items.
The bright side is that 60 degrees feels hot, right?
