Goldwin to Under Armour clothing size

The short answer

Goldwin 3 is Under Armour SM 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 Goldwin Japan sizing size read across to Under Armour. US sizes on the left, Letter on the right.
Goldwin Japan sizing	Goldwin builds it for	Under Armour, by chart	Same label	Under Armour builds it for	Under Armour also prints
1	bust 30.3 to 32.7 in, waist 22.8 to 25.2 in, hip 32.7 to 35 in	XXS	not published	bust 31 to 32.5 in, waist 24.5 to 25.5 in	US 00
2	bust 31.5 to 33.9 in, waist 24 to 26.4 in, hip 34.3 to 36.6 in	XS	not published	bust 32.5 to 33.5 in, waist 25.5 to 27 in	US 0-2
3	bust 32.7 to 35 in, waist 25.2 to 27.6 in, hip 35.8 to 38.2 in	SM	not published	bust 33.5 to 36 in, waist 27 to 29 in	US 4-6
4	bust 33.9 to 36.2 in, waist 26.4 to 28.7 in, hip 37.4 to 39.8 in	SM	not published	bust 33.5 to 36 in, waist 27 to 29 in	US 4-6
5	bust 35 to 37.4 in, waist 27.6 to 29.9 in, hip 39 to 41.3 in	MD	not published	bust 36 to 38 in, waist 29 to 31 in	US 8-10

Tinted rows change label or sit between two sizes. 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

Goldwin Japan sizing size guide, read on 2026-09-25.
Under Armour size guide, read on 2026-09-18. Under Armour on TrueToSize

Under Armour to Goldwin