How can I tell my wife to dress modestly

Salam Been married for a year and i want to know how can I tell my wife to dress modestly without causing a fight. When I tell her she says to not change her and it always causes a fight and she was like this since day 1 and that why am I saying this now. And that she wants me to love her for her without any conditions

Im not telling her to wear a hijab. I just want her to dress modestly and not wear tight cloths as I don’t like it and I started becoming closer to allah.

How can I approach this? What should I say to her? - Divorce isn’t an option