Could you please help me with the parts in brackets:
1. [Levi’s latched on toward the tail end of the trend,] producing its line of Superlows, which eventually spawned Too Superlow jeans and then Dangerously Low jeans for women and men.
2. [Grown-ups, who weren’t at all taken with the back-crack trend,] expressed their confusion. After students at Milwaukee’s South Division High School wearing the extremely low jeans, School staffers found themselves in an odd dress-code position. [“With all the training I’ve had, and all the experience, I never thought I’d have to do booty checks”] said principle Don Krueger.
Latch on- get the point, understand what something is worth- they were late in adopting the fashion and started doiing it when it was going out of fashion
Back-crack- this is the line between the buttocks, so it refers to the fashion for clothers cut so low that part of the bottom is visible.
Booty check- booty = bottom, so I presume it means checking that clothes did not display too much