Long torso or long legs

The test, which is not a tape measure

Sit on a hard chair with your back straight and have someone measure from the seat to the top of your head, then compare it with your standing height. A torso that runs long makes that seated measure a larger fraction of the whole. The classic split is roughly a third torso to two thirds leg, and the useful reading is which side of it you sit on rather than the number itself.

The quicker version, if there is nobody to hold the tape: stand in front of a mirror and find your natural waist, the narrowest point of the torso. If it sits noticeably closer to your hips than to your ribs, your torso is long. If your trousers always feel like they want to sit higher than the shop cut them, that is the same signal arriving as an annoyance.

• Long torso: the engine reads the torso as 0.34 of standing height.
• Balanced: the engine reads the torso as 0.3 of standing height.
• Long legs: the engine reads the torso as 0.26 of standing height.

What it is worth, on the same body

Below is one frame, unchanged in every measurement, with only the vertical line moved. The numbers are effects on a score that starts neutral, and they come from the same rules that fire on a real product: positive is in your favour, negative against, and roughly twenty either way is a strong opinion.

The low rise swings 24 points across the three readings, which is more than most shape rules manage. That is the point of this page: proportion usually outweighs shape, and it is the half of the reading almost nobody has been told to check.

• On a long torso, a low rise: -18. A low rise drops the waistline and shortens the leg. Of every proportion rule, this is the one worth protecting.
• On a long torso, a high rise: +14. A mid-to-high rise lifts the waistline toward the natural waist and lengthens the leg line.
• On a balanced line, a low rise: 0. No rule in the table has an opinion.
• On a balanced line, a high rise: 0. No rule in the table has an opinion.
• On long legs, a low rise: +6. Long legs give you the room to wear a lower rise without losing the line.
• On long legs, a high rise: 0. No rule in the table has an opinion.

Height is the other half of this

The same rules also read height directly, and they cut at 170cm and 185cm. Under the first, volume starts eating height; over the second, the frame has the length to carry it. Someone at 169.5cm is not meaningfully shorter than someone at 170.5cm, so the effect is ramped to nearly nothing at the boundary rather than switched on at it.

A long torso on a shorter frame is the case where rise placement is the biggest single lever available, because both signals point the same way and the rule fires on either of them.

Why the product asks for a photo

A tape measure genuinely cannot tell a torso from a leg, and the fallback that runs when there is no photo returns balanced rather than guessing, because a guess here poisons every proportion rule at once. That is a deliberate refusal, not a gap.

Which means this is the one reading where the at-home test is doing real work. Do the sitting test, decide honestly, and treat the answer as the input that changes rises, hem breaks and top lengths across your whole wardrobe.