Jockey Bra Sizing, Honestly Decoded
Jockey publishes a fit guide that gets the principle exactly right: 90% of your support comes from the band, the band should sit level, straps only steady what the band already holds. The same document then adds four or five inches to your underbust before calling the result a band size. That gap between the stated principle and the printed arithmetic is the whole fitting story, and the widget below shows it in one calculation.
Jockey’s official fit guide contains the clearest statement of the correct fitting principle in the mass-market category: "90% of your support should come from your band." The same guide then instructs adding four or five inches to your underbust before choosing that band. Resolving those two sentences in favor of the first is the entire Jockey fitting story.
Jockey in numbers
Your size and Jockey’s answer
How Jockey sizing works, and the contradiction inside it
The guide’s measuring method is quoted verbatim from Jockey’s own published chart: measure snugly under the bust; "if your underbust measurement is an odd number, add 5 to get your band size. If your underbust measurement is an even number, add 4," with worked examples sending both a 29-inch and a 30-inch ribcage to a 34-inch band. That is the classic add-inches convention, and on modern stretch bands it delivers a band with one to two sizes of built-in slack, exactly the slack that makes the principle of 90% band support impossible to honor.
The contradiction is not subtle: a band that is supposed to carry 90% of the load cannot do it with four spare inches. Every symptom of a loose band, riding at the back, straps tightened until they dig, the cup sitting too low, the underwire sitting on tissue rather than the ribcage, is described in the riding-band guide and the back-pain page with exactly this mechanism.
The rest of the guide is genuinely well-written. The sister-size teaching is correct and the examples are right: a 34C’s sisters are given as 36B and 32D, identical to the math at our calculator. The strap troubleshooting correctly routes strap problems back to the band. The Forever Fit line includes printed between-sizes guidance. All of it is good fitting advice in service of a band that the measuring method set too loose.
Does Jockey run small or big?
Band: Jockey’s printed method adds 4 to 5 inches to the underbust, producing bands that run 1 to 2 sizes large by modern standards. The brand’s own principle: that the band carries 90% of the support; it is best honored by buying the snug measured band, not the add-inches answer.
Cup: The added-inches band also understates the cup: a body that correctly wears a 34D reads out as a 36C or 38B by the +4/5 method. Expect your honest size to sit 1 to 2 bands snugger and a letter or two deeper than the method’s output. The widget below puts both numbers on screen at once.
What to try at Jockey
Shop it by its own best sentence: the band carries 90% of the support, so buy the snug measured band. For the Forever Fit line, the printed between-sizes guidance is trustworthy and worth following once the correct band is established. The sister-size chart in the official guide is correct and useful: if the snug measured band is available only in an adjacent sister size, the guide’s own chart tells you the right move. And when a Jockey band fits but the straps still pull, the guide’s own instruction applies: tight straps mean the band is loose, not the straps are short.
Jockey sizing: answered
How do Jockey bras fit?
Conventionally, once the band is right. The complication is the official guide’s +4/5 band method, which produces a band 1 to 2 sizes loose against the guide’s own stated principle that the band carries 90% of the support. Measure snugly and buy the measured band.
What is the Jockey Forever Fit sizing?
A stretch-flexible line with printed between-sizes guidance: Jockey’s chart marks between-size cases and advises choosing by how your current cups fit. Your snug measured size remains the starting point; the Forever Fit chart handles the edge cases from there.
Why does my Jockey bra band ride up?
The +4/5 measuring method is the usual culprit: it builds slack into the band, and slack bands ride while straps inherit the load. Re-measure snugly, drop to the measured band, and the riding-band fix guide covers the rest.
Does Jockey use the add-inches rule?
Yes. The official guide instructs adding 4 to an even underbust measurement and 5 to an odd one, with worked examples sending a 29-inch ribcage to a 34-inch band. The same guide states the band should carry 90% of the support. Both sentences are published side by side; honor the principle by buying the snug measured band instead of the add-inches answer.
Are Jockey bra sister sizes the same as standard sister sizes?
Yes: Jockey’s own official chart lists 34C’s sisters correctly as 36B and 32D, identical to the standard math. The sister-size section of the guide is one of the better-written parts of it, and the examples are right.
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