When asked how to fasten two pieces of felt together I go back to my sewing roots , and think straight seams and French seams. With more thought I realised that with felt the possibilities are enormous. You can of course sew felt in a traditional way and get a traditional effect. But if you sew it at the prefelt stage , well you can either create an stand out seam or you can make the seam almost completley invisible.
Here is an example, a very small sample.
It almost looks like piping.
Then of course you might want an invisible seam , and these example would be almost invisible if I had chosen a more sympathetic thread colour.
My favorites seams are using a fabric or yarn to make the seam , I think this could look really cool , with slightly more exciting colours , and adds a flexibility that could be very wearable in a felted garment.
All I need now is to work out how to make a jacket so I can use my seaming skills.