Jerry Lee at What Price Glory does reproduction WWI British Army kilt aprons (based on a 1917 style) - he also offers Canadian ones.

I bought two (British Army style) off him to use as aprons in my workshop. As one would expect, the tops come up to the ribcage, and so there are three draw-strings, and there's a pocket in the front where the sporran would be (or where one would expect a pocket on an apron).

The apron is a complete wrap around affair, with a single side opening on the right. It is pleated at the back of the skirt, and flat at the front.