How to say "bell-bottoms" in Japanese

• ベルボトム
  nounCovers 'bell-bottoms' in its literal sense: pants that flare out from the knee, also called flares. Use it when naming the garment itself, for example in talk about fashion or someone's outfit.
  どうしたの、ベルボトムなんかはいて。↗

  Have you lost your marbles, wearing those bell-bottoms?
• パンタロン
  nounA loanword covering 'pantaloons' and 'trousers' generally, with 'bell-bottoms' as one sense. In fashion talk it can mean the flared style, but it is less specific than ベルボトム, which names the shape outright.
  会社かいしゃにパンタロンとアロハシャツを着きてくる彼かれは、かなりユニークな存在そんざいだ。↗

  He's a pretty unique guy, wearing bell bottoms and Hawaiian shirts to the office.

Both are less common loanwords: choose 「ベルボトム」 for the flared trousers called bell-bottoms, while 「パンタロン」 is a broader word for trousers and pantaloons that also has the bell-bottom sense.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• ベルボトムbell-bottoms
• パンタロンpantaloons