You can use the sheaths that come with them. Check the Falkniven site, as they can supply the WM-1 with a neck sheath or belt sheath, I think. I have the neck sheath version that also has the holes for the optional Tek-Lok.
Take a look at Dozier's small blades as noted above. I have the small utility. What makes these cool is Dozier's excellent sheath work. Here is the reason you might like these better (besides the quality of the knife)
The Dozier belt sheath places the clip on center of the sheathed knife width. What this means is, with a small length blade, both ends tend not to stick out all that much. In contrast, if I put the Tek-Lok on the WM-1 sheath, this blade, which is the same overall length as my Dozier, puts the Tek-Lok closer to one end, so that the handle sticks out more than I'd like - to the extent that I may as well carry a longer blade in a similar position on my belt.
Maybe decide where you really want to have the blade carried - that might help you decide.
The WM-1 is cool in that it's small enough for jeans pocket, slim enough for non-printing neck carry - and you can afix the Tek-Lok, so long as you don't mind the handle sticking out a bit.
Otherwise, a small Dozier is amazing for daily belt carry horizontally.