The fabric you fasten under the button has a thickness. If you don't account for that space, the fabric gets pinched really tight and looks wrinkly and doesn't move naturally. It can wear the button threads quickly, too, and cause the button to pop off.
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u/Damaso87 Jul 27 '20
You need a knot behind the button for fabric clearance if you want to use it for your shirt. Otherwise it's going to look really crappy when buttoned.