I'm a JW.and need help!?!?!please answer my question!?

I am a Jehovah's Witness. I am in a Spanish Congregation in Schaumburg Illinois.I gave a suggestion to a Sister who gave a part in the Ministry School wearing Jeans..I told her they really werent' appropriate. A Brother older than me told me what I did was wrong.I didn't impose my ideas but he said it's ok to wear Jeans and give a part. I know for FACT it's not.unless you really have bad cirstances...but I want to show him either a Magazine or some type of info that says JEANS are innappropriate for giving parts. I need some help?!?! i've tried everywhere else...and thought a fellow brother could help:)