There are many different methods of grading between sizes.
The following are merely a guideline.

LADIES
SIZE	S	S/M	M	M/L	L	L/XL	XL	XL/XXL
SA	8/32	10/34	12/36	14/38	16/40	18/42	20/44	22/46
EU	36	38	40	42	44	46	48	50
UK	10	12	14	16	18	20	22	24
US	4/6	8	10	12	14	16	18	20/22
AUS	8	10	12	14	16	18	20	22
Bust - cm	83-86	87-90	92-95	96-99	100-105	104-111	110-117	116-124

MEN
SIZE	S	M	L	L	XL	2XL	2XL	3XL
SA	36	38	40	42	44	46	48	50
EU	46	48	50	52	54	56	58	60
UK	36	38	40	42	44	46	48	50
US	36	38	40	42	44	46	48	50
AUS	36	38	40	42	44	46	48	50
Bust - cm	90-94	94-98	98-102	102-106	106-110	110-114	114-118	118-122

CHILDREN
SIZE	2Yr	3Yr	4Yr	5Yr	6Yr.	7Yr	8Yr	9Yr	10Yr	11Yr	12Yr	13Yr	14Yr
SA Height in cm	89	97	104	111	117	123	128	134	140	145	151	160	170
AUST. Standards Heights in cm	92	100	108	115	120	125	130	135	140	145	150		160
EU Height in cm	92	98	104	110	116	122	128	134	140	146	152	158	170

INFANTS
SIZE	Newborn	3m	6m	9m	12m	18m	24m
SA Height in cm	52	60	66	71	74	81	86
AUST. Stds Heights in cm		62	68		76	84	92