I can tell you from experience that it is better to give the gift card than to try to figure out what size "do dads" to get her. I made that mistake one time and quickly learned my lesson.If in doubt, give her a gift card to Victoria's Secret. That always seems to be popular at my house. My wife likes to get her underwear there (I guess that's what you call do dads fancy as them). My wife uses some type of perfume from there too so it's always a good gift.