I think you are absolutely correct.
Now, I'm not exactly the trendiest guy. My closet consists of suits for work, kakhis and collared shirts for school, and t-shirts and jeans for weekend wear. Somewhere between college and law school, my wardrobe got conservative. Of course, losing 100 lbs. in 18 mos. helped force me to buy all new clothes, and at my stage in life, they have to be business casual or professional. But it didn't use to be this way. In high school, I liked baggy pants and gelled hair. In early college, I bleached my hair (briefly). Dumb, stupid stuff I'd never do now. It was a harmless phase, albeit stupid.
There's a world of difference between baggy pants and shorts and letting them sag so that your boxers are visible to the world; a difference between a girl wearing jeans and wearin skin-tight jeans; girls wearing shorts and wearing short shorts. Modesty should not be confused with conservative dress. Bell bottoms are modest, but they look ridiculous. But, anyone who wishes to wear them may do so since it doesn't impact any moral issues.
One aside: I really wish girls knew better just how sexy modesty is. Girls flashing cleavage are a dime a dozen now. Summer on campus is a difficult time to try to keep one's eyes to oneself, but at the end of the day, looking at them is a cheap thrill. The girls who wear feminine yet modest dresses, blouses, and pants are absolutely beautiful. There's just some je ne se qua about them that the girls wearing scanty clothing just can't show.
My son did that this year, strictly as a swim team thing. Most of the guys on the swim team do it just before sectionals as a kind of a take off, or sarcastic commentary, about what that much chlorine does to ones hair. Then they all shave it off the day before sectionals and all look like a bunch of punk skin heads till it grows back in. *sigh* I know what people are thinking when they look at him. What's a mother to do?