What exactly would fall under the sin of vanity? For example, is it vanity for a woman to style her hair and put on makeup if she were married and wanted to maintain a pretty appearance for her husband? Even though she also would be seen in public and perhaps other men may find her attractive? Her style of clothing is simply stated with nice jeans and tshirt with no jewelry (other than wedding ring) or colorful clothing to attract undue attention.
Would such a woman, in order to avoid falling into vanity, need to wear a plain hairstyle, little to no makeup, and baggier clothing? Again, her main reason for choice of hairstyling, makeup, and clothing is for her husband.
Where exactly is the line of vanity drawn? Thank you.