She wore a beautiful collar on her dress.

A band of fabric that encircles the neck of a garment, often providing structure or decoration.
The dog had a bright red collar.
He adjusted the collar of his shirt before the meeting.
The collar on her jacket was very stylish.
dress collar
dog collar
shirt collar
neckband
neckline
facing
The dog wore a bright red collar.

A band or strap worn around the neck of an animal, typically for control or identification.
She bought a new collar for her cat.
The puppy's collar had a tag with its name.
He adjusted the collar to make it fit better.
dog collar
cat collar
collar tag
neckband
strap
harness
She buttoned her shirt and adjusted the collar.

A band of material worn around the neck, often as part of a shirt or coat.
He wore a tie under his collar.
The collar of her dress was beautifully embroidered.
I prefer a soft collar for comfort.
buttoned collar
collar size
collar style
neckband
lapel
facing