In the "Pastoral Symphony" segment, Diana the goddess of the moon is only wearing a thin fabric that covers her sensitive parts.
In the "Nutcracker Suite" sequence, the fairies in "Dance of the Sugarplum Fairy" and "Waltz of the Flowers" are nude. Although, they aren't drawn with breasts in every shot.
In the "Pastoral" sequence, the are brief scenes of female centaurs with exposed breasts (without nipples) as they are seen bathing. After the bath scene, their breasts are covered by flower wreaths, long hair, etc.
In the same sequence Cupids fly around in the nude, buttocks exposed (without genitalia). There is a gag toward the end of one movement in which a cupid's rear end forms a heart.
There is a quick, brief moment during the "Night on Bald Mountain" sequence in which two flying harpies' breasts are visible very closeup. Unlike the centaurs, these harpies are anatomically correct.