What is this accessory that shortens pant length? They're called Zakkerz.
Zakkerz are magnetic Strips you can use to create a temporary hem when switching from heels to flat shoes.
How do zakkerz work?
Roll pant leg up to desired length, then wrap zakkerz around bottom of pant with one end of zakkerz inside pant leg and other end outside pant leg. The magnets bring the two ends of the zakkerz together – holding the roll-up in place.
zakkerz will hold your rolled pant legs in place when you need to temporarily shorten them without damaging your pants in any way!