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Convert / Women's clothing

Whistles to Athleta clothing size

The short answer

Whistles 14 is Athleta M or L by the two brands' own charts.

Both brands publish the body bust each size is cut for, so every row matches a bust, not a letter or a number.

Every Whistles size read across to Athleta. UK sizes on the left, Letter on the right.
WhistlesWhistles builds it forAthleta, by chartSame labelAthleta builds it forAthleta also prints
04bust 30 in, waist 23.5 in, hip 34.5 innot madenot publishednot publishednot published
06bust 31 in, waist 24.5 in, hip 35.5 inXXSnot publishedbust 31.5 in, waist 24.3 in, hip 34 inUS 00
08bust 32 in, waist 25.5 in, hip 36.5 inXXSnot publishedbust 31.5 in, waist 24.3 in, hip 34 inUS 00
10bust 34 in, waist 27.5 in, hip 38.5 inXS or Snot publishedbust 32.5 to 33.5 in, waist 25.3 to 26.3 in, hip 35 to 36 inUS 0-2
12bust 36 in, waist 29.5 in, hip 40.5 inS or Mnot publishedbust 34.5 to 35.5 in, waist 27.3 to 28.3 in, hip 37 to 38 inUS 4-6
14bust 38 in, waist 31.5 in, hip 42.5 inM or Lnot publishedbust 36.5 to 37.5 in, waist 29.3 to 30.3 in, hip 39 to 40 inUS 8-10
16bust 40 in, waist 33.5 in, hip 44.5 inLnot publishedbust 39 to 40.5 in, waist 31.8 to 33.3 in, hip 41.5 to 43 inUS 12-14
18bust 42.5 in, waist 35.5 in, hip 46.5 inXLnot publishedbust 42 in, waist 34.3 in, hip 44.5 inUS 16-18
20bust 45 in, waist 38 in, hip 49 in1Xnot publishedbust 44.3 to 46.3 in, waist 38 to 40 in, hip 47.3 to 49.3 inUS 16W-18W
Tinted rows change label or sit between two sizes. 1 sizes have no counterpart on the Athleta chart. Read from the two charts only; no formula and no averaging.

What wearers say

Charts describe a garment, not a fit. We do not collect fit reports for this category yet, so this table is the two brands' own claims and nothing more.

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Sources

Athleta to Whistles