This could be around weight 6 or 7 since it's only leather and maybe add some shirt under it to make it normal say making it over the existing tunics for example.
And this is for those people that keep on asking for a light heraldic armor maybe put some mail under the shirt or make it all in thick leather to cover the arms too.
Now i know it's a lot of work and since I can't do them most if not all would probably be never made I'm just asking for more light armor archer could use since the ones we have the 8 weight and 9.5 are either ninja/samurai armor and the tunic over mail looks horrible.
The stats should be around 30 to 35 to make the lamellar still better than the previous ones but this way people could have more choices on what light armor to use.