They fit most perfectly with the "more rounded" longcoat, like the white one the count from the blisterpack wears.
Other examples with this coat: the new blue (French or Spanish) soldiers from the updated Pirates Theme, and the Redcoat Officers from the previous pirates´series, as well as the Super 4 Pirates.
Some "older" have a somewhat different shaped longcoat. Fits the swordbelt too, but just a little less well.