How can I tell my friend to dress more appropriately without hurting her?

My birthday is coming up and my family are the types of people who are very modest people. My grandma, aunts and uncles are going to be there. And she wear very indecent clothing at the most unappropriate times. Its pratically something that you wear at clubs not birthdays. She's 16 and how do i tell her to... show more My birthday is coming up and my family are the types of people who are very modest people. My grandma, aunts and uncles are going to be there. And she wear very indecent clothing at the most unappropriate times. Its pratically something that you wear at clubs not birthdays. She's 16 and how do i tell her to dress less revealing.?

Her shorts would be considered underwears to most people, since some parts of her butt shows.

Please help! I dont want to upset her!
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