My mom dresses bad

If I were you I first of all tell my stupid friends not to speak that way about my mother. Tell them it makes you uncomfortable.

Also, tell your mom how you feel. Tell her she should would looks so much more attractive and beautiful if she dressed classy and age appropriate. Tell her you;re just looking out for her because you love her and you don't want people to get the wrong impression about her. I think she will understand and appreciate your input.