At "oops" you put your fingers to your lips and at "missed a spot" you put them out in the air. Hard to explain but it's like blowing a kiss. A CM taught it to us one year!
That is my oldest daughter. We were teaching her how to do it. I had gotten my granddaughter the clothing for Christmas. My daughter doesn't usually dress like that.
It makes me want to go on another Disney cruise, just to see the older brothers, dads and granddads try the 'princess wave' ... or maybe learn how to be a make believe prince ... just so much fun thinking about it. Thanks Kathy for the information and video.