Both Uses of

chaste
in
Tess of the d'Urbervilles

He would not say whether or not she had attached herself to the sound Low Church School of his father; but she would probably be open to conviction on that point; she was a regular church-goer of simple faith; honest-hearted, receptive, intelligent, graceful to a degree, chaste as a vestal, and, in personal appearance, exceptionally beautiful.†
Chpt 4

chaste = not having sexual intercourse (ever, outside of marriage, or for a long time); or not involving sexual desire

Since she is pure and chaste, she would have been refined enough for me.†
Chpt 5 *

Definitions:

(1) (chaste as in: remained chaste)
not having sex; or not involving sexual desire
The exact meaning of not having sex depends upon context. It can mean
- to be a virgin (never have sex)
- to be sexually inactive currently or for a long time
- to not have sex outside of marriage
(2) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

Much less commonly, chaste can refer to an unornamented simple style.