noun, noun which may take the genitive case particle 'no'
V-neck
Refers to a V-shaped neckline on clothing. Often used as a noun or with の to modify another noun.
He is wearing a V-neck sweater.
このＴシャツはＶネックですか、それともクルーネックですか。
Is this T-shirt a V-neck or a crew neck?