We will also be there from 2/14-2/18. I have bookmarked accuweather.com's 15 day forecast for Orlando, FL. So far the weather for that time looks like clouds/sun with highs around 65-70. I know 15 days is not as accurate as say a 5 day forcast but if you can wait to pack until a few days before you leave (which I am hoping to do) you may not need to bring clothes you will not wear. (i.e. big winter jackets) I'm hoping to fit all our clothes into our carry-ons (with a collapsible duffel packed in case we buy too many souveniers.

So my advice is to keep watching accuweather's site and you will know pretty much what clothes you will need.