noun which may take the genitive case particle 'no'
oversize; oversized
Used in clothing contexts to describe garments that are intentionally larger than standard sizing, often for a relaxed or fashionable look.
今年はオーバーサイズのジャケットが流行っている。
Oversized jackets are in fashion this year.
彼女はオーバーサイズのTシャツを着て、リラックスしたスタイルを楽しんでいる。
She wears an oversized T-shirt and enjoys a relaxed style.