Chastity is sexual conduct of a person that is deemed praiseworthy and virtuous according to the moral standards and guidelines of their culture, civilization or religion. The term has become closely associated (and is often used interchangeably) with sexual abstinence, especially before marriage and outside marriage. It is the counter to the sin of Lust.

If you look at the crown as a metaphor for virginity, then I pick Rapunzel.

She's so pure.

Snow White and Cinderella are both very pure, but since Cinderella is older it seems to fit her better. Patience is also part of chastity and Cinderella represents the other virtue of patience to me as well. I think a few others represent chastity well too, I chose Cinderella because I think if she had all the opportunity to have sex she would still wait until marriage.

I think so, she's portrayed as so naive and innocent.

Because she is opposed to Bimbettes. Also Rapunzel.

or Snow