My horse wears a size 74. I got her a new rain sheet for this spring.  Its a little big on her.  In the front it hangs down low,and i can pull it back on her shoulders. Im afraid that it will rub on her while shes outside in the field.  I don't want to go down a size because it will be short on her back/butt.  My horse is old and her body isn't filling up the room in the rain sheet.  

Any ideas?

From,

Laura