Please help... Need little sister advice

Diana • Not TTC at the moment .
Guys, 
I always tell my little sister don't wear leggings or don't dress open and well it was Halloween and I went to the club with my boyfriend that day. I dressed up as rosita from the walking dead. That costume was a little provocative for Halloween but not really. I don't wear anything "slutty" or super tight on normal bases. I just wanted to look really sexy on Halloween since it's my first time going to a Halloween party ( in 21) 
 my little sister (11 yrs old) follows my boyfriend  and since he posted our picture together. She's told me how surprised she is at me and how I'm hypocritical I am. She'll use it against me to show my mom if I'm "mean " to her. 
I feel like a bad example. 
Seriously guys! All that was "provocative" was my stomach open -_- 
How do I handle this??? 
That's my costume 

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