DE to IT clothing size

The short answer

By the formula, DE 40 is IT 46. On brand charts the most common answer is 46 (1 of 2 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.

DE to IT. The formula column is arithmetic; the brand columns are read from 2 brand charts checked by hand.
DE	IT by formula	Most brands print	Other answers in print
30	36	not published	not published
32	38	not published	not published
34	40	40 (2 of 2)	42: J.Crew
36	42	42 (1 of 2)	44: J.Crew
38	44	44 (1 of 2)	46: J.Crew
40	46	46 (1 of 2)	48: J.Crew
42	48	not published	not published
44	50	not published	not published
46	52	not published	not published
48	54	not published	not published
50	56	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 DE 34: brand charts print anything from IT 40 to 42 for the same size.