Please use the following charts to convert from the Australian sizing system to your local system (please note - Japan uses the Continental European sizing system).

BRAS
Australian	American	Continental European	English
10	8	85	32
12	10	90	34
14	12	95	36
15	14	100	38
18	16	105	40
20	18	110	42

BRIEFS
Australian	American	Continental European	English
10	8	1(40)	24
12	10	2(42)	26
14	12	3(44)	28
16	14	4(46)	30
18	16	5(48)	32