Prior to buckling the belt, while still laying down, slide the dirk on the right, sporran to the left, then buckle the belt, The sporran will sit overtop of the buckle most likely.

As for bag hose, Ive only ever made my own, developed with the help of someone 30 years ago, and have continued to use that.

Kate Henry's pamphlet on how to construct bag hose has a different pattern that I might try on my next pair.