I know it's just a number, but couldn't I have lost a size in this conversion rather than gaining one? :)

European	32	34	36	38	40	42	44	46	48	50
UK	4	6	8	10	12	14	16	18	20	22
Japan	5	7	9	11	13	15	17	19	21	23
USA	2	4	6	8	10	12	14	16	18	20
USA LETTER	XS	S	S	M	M	L	L	XL	1X	2X