safety pin
Noun
Meaning
a pin in the form of a clasp; has a guard so the point of the pin will not stick the user
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Examples
You can either reattach the old straps with a safety pin or use a piece of rope to make new lace-up sandals.
The star donned white sweatpants which had a giant safety pin carefully placed on the front.
The sweatpants dipped low on her abdomen, with a silver safety pin pinned to the front of the pants.
I quite like the idea of just putting a safety pin, empty of anything else, on your coat.