IT to FR clothing size

The short answer

By the formula, IT 46 is FR 42. On brand charts the most common answer is 42 (2 of 3 brands), and 2 different answers are in print.

The formula and the brands' most common answer agree on every size below. Use the brand's own number for the brand you are buying.

IT to FR. The formula column is arithmetic; the brand columns are read from 3 brand charts checked by hand.
IT	FR by formula	Most brands print	Other answers in print
36	32	32 (1 of 2)	34: Reiss
38	34	34 (2 of 3)	36: Reiss
40	36	36 (2 of 3)	38: Reiss
42	38	38 (2 of 3)	40: Reiss
44	40	40 (2 of 3)	42: Reiss
46	42	42 (2 of 3)	44: Reiss
48	44	44 (1 of 2)	46: Reiss
50	46	46 (1 of 2)	48: Reiss
52	48	not published	not published
54	50	not published	not published
56	52	not published	not published

Tinted rows: the formula differs from the brands' most common answer. A brand is counted once per answer.

The widest split is at IT 36: brand charts print anything from FR 32 to 34 for the same size.