neck ornament; jewelry worn at the neck or collar
Refers to decorative items worn at the neck or collar of Western clothing, such as brooches, necklaces, chokers, or similar accessories.
She chose a gorgeous neck ornament to match her dress.
This neck ornament is an antique brooch handed down from my grandmother.
Specifically a necktie. Cross-referenced with ネクタイ, and this usage is less common than the general neck-ornament sense.
See also: ネクタイ
Looking at old photos, my grandfather always wore a necktie.
首飾り is a general term for 'necklace' or 'neck ornament', but 襟飾り specifically refers to items worn at the collar or neckline of clothing, often with a more decorative or formal nuance.
Compound of 襟 (eri, 'collar') and 飾り (kazari, 'decoration'). The reading is a straightforward combination of the kun'yomi of each kanji.