The necklace

Hi, everyone.

Could you tell me the meaning of this paragraph(in bold) in simple words?

She dressed plainly because she could not dress well, but she was as unhappy as though she had really fallen from her proper station; since with women there is neither caste nor rank; and beauty, grace, and charm act instead of family and birth. Natural fineness, instinct for what is elegant, suppleness of wit, are the sole hierarchy, and make from women of the people the equals of the very greatest ladies

Source; https://genius.com/Guy-de-maupassant-the-necklace-annotated