骨スト

• Reading: こつスト
• Romaji: kotsu suto
• Kanji breakdown: 骨 (bone) + スト (straight, abbreviation) → straight bone type
• Pronunciation: /ko.tsɯ sɯ.to/

Meaning

Straight body-frame type in 骨格診断 (bone structure diagnosis); characterised by a defined, structured body with prominent joints.

骨スト is an abbreviation used in the hugely popular Japanese self-styling system 骨格診断 (skeletal diagnosis). People diagnosed as 骨スト (straight type) are said to have a body with defined muscles, prominent collarbones, and a structured silhouette. This type is advised to wear fitted, simple, high-quality pieces. The three-type system (ストレート, ウェーブ, ナチュラル) dominates Japanese fashion advice, with people using their type to guide all clothing and styling decisions.

Examples

1. 骨ストだからVネックとタイトスカートが似合うって言われた。 I was told V-necks and pencil skirts suit me because I'm a straight type.
2. 骨ストの着痩せコーデ探してるんだけどいいの見つからない。 I'm looking for slimming outfits for straight types but can't find good ones.
3. 骨ストってシンプルな服がハマるからコスパいいよね。 Straight types look great in simple clothes, so it's actually cost-effective.

Usage Guide

Context: fashion, beauty, self-diagnosis, social media

Tone: analytical, informational

Do Say

• 私骨ストだからジャストサイズの服が一番似合うんだって。 (I'm a straight type so apparently fitted clothes suit me best.)
• 骨ストさんにおすすめのブランドってどこ？ (What brands do you recommend for straight bone types?)

Don't Say

• 「骨ストだからゴツいんだね」は体型批判に聞こえる (Saying 'you're straight type so you're bulky' sounds like body criticism)

Common Mistakes

• Treating 骨格診断 types as strict rules — they are guidelines, not absolute prescriptions. Many people mix advice from different types.

Origin & History

Abbreviation of 骨格ストレート (kokkaku sutorēto, straight skeletal type). Part of the 骨格診断 system popularised in the 2010s by Japanese image consultants and fashion magazines. Became viral on social media around 2019-2020.

Cultural Context

Era: 2010s system, viral from 2019-2020

Generation: Women in their 20s-40s primarily

Social background: Fashion-conscious consumers

Regional notes: Used across Japan. Part of the broader 骨格診断 self-styling trend that dominates Japanese fashion media.