True & Co to Le Mystere bra size

The short answer

True & Co XL is Le Mystere 40C 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 Le Mystere. Brand's own sizes on the left, US on the right.
True & Co	True & Co builds it for	Le Mystere, by chart	Same label	Le Mystere builds it for	Le Mystere also prints
XS	not published	32C	not published	not published	UK C · EU C · FR C · AU C
S	not published	34C	not published	not published	UK C · EU C · FR C · AU C
M	not published	36C	not published	not published	UK C · EU C · FR C · AU C
L	not published	38C	not published	not published	UK C · EU C · FR C · AU C
XL	not published	40C	not published	not published	UK C · EU C · FR C · AU C
1X	not published	42C	not published	not published	UK C · EU C · FR C · AU C
2X	not published	44C	not published	not published	UK C · EU C · FR C · AU C
3X	not published	46C	not published	not published	UK C · EU 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
Le Mystere size guide, read on 2026-09-18.

Le Mystere to True & Co