I need to sew a button on my shirt.

A small fastener used to secure clothing or accessories.
She lost a button from her coat.
He pressed the button to close the jacket.
The dress has a shiny button on the front.
shirt button
button hole
button up
fastener
clasp
stud
She pressed the button on her shirt.

A small, usually round object that is used to fasten clothing or other items.
He lost a button from his coat.
Please sew that button back on.
The shirt has a missing button.
shirt button
button up
button fastener
fastener
clasp
snap