The fusible I use for hand embroidery is pellon SF101 - Shape Flex. It is an all purpose woven fusible interfacing. It doesn't add a lot of bulk and is easy to hand stich through. I've used in when I want to put Onasburg in my quilts. That is such a flimsy fabric and the pellon adds just enough to stabilize it. Only one shop in my area carries this interfacing = it may be hard to find.