True & Co to Triumph bra size

The short answer

True & Co XL is Triumph 90C by the two brands' own charts.

Cups are counted along each brand's own letter order, and the band is carried across unchanged.

Every True & Co size read across to Triumph. Brand's own sizes on the left, EU on the right.
True & Co	True & Co builds it for	Triumph, by chart	Same label	Triumph builds it for	Triumph also prints
XS	not published	70C	not published	not published	UK C · US C · FR C · AU C
S	not published	75C	not published	not published	UK C · US C · FR C · AU C
M	not published	80C	not published	not published	UK C · US C · FR C · AU C
L	not published	85C	not published	not published	UK C · US C · FR C · AU C
XL	not published	90C	not published	not published	UK C · US C · FR C · AU C
1X	not published	95C	not published	not published	UK C · US C · FR C · AU C
2X	not published	100C	not published	not published	UK C · US C · FR C · AU C
3X	not published	105C	not published	not published	UK C · US C · FR C · AU C

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. People who own both brands describe a fit, and their answer ranks above this table once five of them stand behind it. Pick your size in the converter to see whether there are enough yet.

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Sources

True & Co size guide, read on 2026-09-18. True & Co on TrueToSize
Triumph size guide, read on 2026-09-18.

Triumph to True & Co