They don't scream SUPER sexy to me like Eris or Esmeralda do. However, I do think they're sexy in a more subtle and understated way.

although in no way are either of them underrated in beauty

definitely. I always thought Aurora was. I dont know why, but none of the classics ever get called sexy (well, for Snow it's understandable I guess since she's 14, but Jasmine and Ariel are only a year and two years older and are hypersexualized). I guess because they dress modestly and people think you need to show a lot of skin to be sexy.

I don't know if I find Giselle that sexy, but definitely in cartoon form more than her live action one. her hair and dress are kind of sultry, though.

I don't really find Giselle sexy, she reminds me of Snow White, both in age and personality.