Newbie with diy question

[Tartan Hiker]

With light weight fabric a good option is to use knife pleats instead of box pleats. This will add mass to the rear of the kilt because you'll use more fabric. I've found that using 5 or 6 inches (12-15 cm) of fabric in each pleat provides enough mass without being too hot. I have a 38 inch (96 cm) waist, and my hiking kilts take a bit more than 5 meters of fabric, and have about 20 pleats with a 1.5 inch (4 cm) reveal at the hip and a 1.25 inch (3 cm) reveal at the waist.
You have the X-kilt instructions, which are great for teaching you the basic "philosophy" of kilt making. If you understand how to make a box-pleat, you can easily handle a knife pleat. Also, make the apron wider (one-half your waist dimension) as if you are making a traditional kilt.
I just laid out a camoflage hiking kilt last night, and was going to take some photos for my own records of the marking and folding process. If you'd like I will post those photos to show you how I make my pleats. There are also other threads here that discuss knife pleating.
A sporran, properly weighted with your usual gear (wallet, keys, etc.) and a handful of coins should prevent the front aprons from flying up far enough to be embarrassing.
Cheers,
TH

Oh, and welcome to X-Marks!

[Tartan Hiker]

And Jim's liner idea is a good one if you don't want to always use the sporran. You only need to line the inside of the under apron, that way you don't really have to worry about what it looks like since no one will ever see it. If the over apron flies a bit, no problem. Use nice soft material since that will be against your anatomy. I've done this with cotton knit (t-shirt material) and it works well.
Be sure to wash all the fabrics well before putting them together so that you don't have a problem of one fabric shrinking more than the other! Stitching the liner only along the top and about half way down the sides, leaving the bottom unstitched also helps with possible shrinkage issues.

And back to your original post...never use velcro or pins to attach the aprons together. It may seem like a good option, but it doesn't work at all. The aprons need to move past one another as you move.