[hat-pin] 
| a long pin for securing a woman's hat to her hair, often having a bulbous decorative head of colored glass, simulated pearl, or the like. |
| hat·pin (hāt'pĭn') n. A long straight pin usually with an ornamental head, used to secure a hat to the wearer's hair. |
hatpin
long, ornamental pin used for decoration and for fastening a woman's hat securely to her hair. In the late Victorian era and the beginning of the 20th century, the hatpin became a popular and important clothing accessory.
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