SQL & PL/SQL

i have two tables

 table pants

id amt
1 50
1 50
1 50


table jacket

id amt
1  50
1  50
1  50

when i do a select  of say 


SELECT  a.id, b.id   SUM(a.amt),sum(b.amt) from pants a, jacket b WHERE A.ID = B.ID group by a.id, b.id 


/* i get a really awkaward result i can't understand what im doing wrong*/

i would like to get just one line with the result set


a b a.mt b.amt
1 1 150 150


but instead my amounts get duplicate like 3 or four times. like 450 and 450 ????
I have tried using DISTINCT on the sql but i have gotten no where can anyone throw me a bone here.
Thanks in advance.