Watson--there's also a brand called Invisthread (think that's right) that is very fine but not colorless. I use Superior's monopoly for when I don't want the thread to show--works on long arm and DSW both (may need to adjust tension a little less although I haven't had to with either--just be sure to use the netting cover that comes with it so it doesn't come off the spool/cone too fast). The Superior monopoly comes in clear for light fabrics and a smoke for darker fabrics. It's very fine thread and doesn't feel stiff at all. This for your horse?? Can't wait to see that!