Here's an update:
Just got the fabric and some materials today.

Managed to find some 100% cotton fabric for a total of about $4.50 (a little over 2 yards). I also picked up 5ft of industrial strength Velcro (yes I plan to use it to hold the kilt on me, already planned out a way to keep it hidden from sight while keeping the kilt snug even as I loose sizes). Picked up some no-sew buttons also (for the detachable cargo pockets). Picked up some matching thread also.

Total cost of materials: Less than $20

So basically if I horribly screw up, I'm out $20 and some time.

I will likely be measuring out the fabric and doing some sewing tonight or tomorrow (have to clean off the sewing desk).

I will be sure to post pictures!