Step 1: Step 1: Measurements
The only 2 measurements you will need are waist and knee length.
First is your waist measurement (measurement A in the picture). Don't use your pants size, kilts are worn much higher on the waist so measure around at your bellybutton, with the tape measure as parallel to the floor as possible. (This number will be divided by three and used extensively throughout this instrustable so if you want to round your numbers up to make the math easy go ahead. The difference can be covered by the front and under aprons.)
(Note: If your hip measurement is larger than your waist measurement then use your hip measurement. The belt will bring in the waist, or if you know how, go ahead and taper in the waist while pleating.)
Next is to measure your knee length (Measurement B in the picture). Kilts should go down to your kneecaps, ending right about the middle of your kneecaps. The best way to measure this is to kneel on the floor and measure from your waist line, at your bellybutton, down to the floor.
Record these measurements
For example: my measurements are
Waist: 45 Inches
1/3rd Waist: 15 inches
Length: 24 inches
Now a few definitions:
Front Apron: The non pleated front of the kilt that shows when you wear the kilt.
Pleated Length: The heavily pleated length that comprises the back of the kilt.
Under Apron: The non pleated portion that wraps underneath the front apron when you wear the kilt.
Waist Band: The very top, unpleated portion that runs the length of the kilt.