Here is my version of Japanese short rows in the round.  You will need safety pins to work this, though it may be possible without.  The pins make in much easier.  I chain my pins together to help keep track of how many short rows I need to make.

Knit side short row:   Knit to where you want your first short row, turn.   Place safety pin on working yarn.
Purl side short row:   Slip first stitch.   Purl across to next short row placement.
Turn and place safety pin on working yarn.   Knit across to next short row placement (4 stitches before last knit side short row for the britches pattern) and work next knit side short row.   Continue in this manner until all short rows have been worked.
You will have 4 safety pins on each side.
Closing the holes:   Knit to the first gap.  Pick up safety pin.
Place loop with safety pin on left needle and knit loop together with next stitch.   The trick to getting no loop in the back is to put the loop on the needle knitwise (pic coming soon).
This is where this version differs from others.  Do not turn, knit around to 1 stitch before the right side short row holes.
Slip next st.
Pick up loop with safety pin and place on the left needle.  It will be pretty tight.
Place slipped stitch back on to left needle and knit it together with the picked up loop like you would knit an ssk.
Tada!   Left side short rows.
Right side short rows.