This is the 7642nd most frequent Russian word.
женское
Feminine or female.
Here, 'женское' is used as an adjective derived from the noun 'женщина' (woman), describing an attribute pertaining to women, specifically indicating that the dress is designed for women.
Она купила новое женское платье.
She bought a new women's dress.
In this sentence, 'женских' is the adjective form in plural, used to describe the concept of rights as being associated with women (women's rights).
У них было собрание для обсуждения женских прав.
They had a meeting to discuss women's rights.
Again, 'женской' is used in the genitive form as an adjective to describe the type of clothing, indicating that the section specifically sells clothing for women.