astonished at beholding a beautiful girl, clad in a dress
"[The prince] stooped and peeped through the keyhole to see what was inside, and was greatly astonished at beholding a beautiful girl, clad in a dress so dazzling that he could hardly look at it." Read the story: http://pondripplefabric.blogspot.com/2011/04/donkey-skin-from-andrew-langs-grey.html