Here’s my experience using the Perfect Fit button, see original topic here ->

I decided to try this wearing a pair of Boyfriend jeans that would stretch out a little during the day and not fit the best but sizing down was not an option.

Photos 1-3- Jeans before using the button, notice the slight bagginess.
Photo 4- Perfect fit button on jeans
Photo 5- Jeans buttoned using new button
Photos 6-9- Jeans using perfect fit button, fit so much better! I wore a belt as directed to cover the button, first was a skinny belt which covered the button but the belt is a bit ratty, so I tried a wider belt which looked nicer.

Overall I am very happy with this product and the results!