This is how I made my boot covers for my Elesis cosplay. I hope this is able to help you--even with my poor quality photos.
First I made a mock-up using muslin fabric. To create my pattern I laid my leg (wear the shoes you'll be using when doing this) on the fabric and traced around it as best as possible, giving some extra room since a leg isn't, well, flat. It's a good idea not to cut out the exact shape until later, for now keep some extra fabric around what you have traced out.
The fabric I'm using for the boot covers is not stretchy. You need to take that into account when making boot covers. With non-stretchy fabric you either need to widen at the ankles or add a zipper. Ankles are typically much smaller than your foot, so that part of the boot cover may not slip over your foot. A similar thing can happen at the knee--this is why it's a good idea to make a mock-up, to make sure everything fits right and avoid messing up on the nice (and probably more expensive) fabric.
For stretchy fabric you probably won't have to worry about these problems. You typically size stretchy fabric smaller than your actual measurements so that it'll fit correctly and snugly when worn.
Cut out the pattern plus that extra fabric and pin it together. Then try it on. Keep adjusting the pins as needed until you're about to slide it on and off with little to no difficulty.
If you're using a zipper just make sure to have a bit extra for attaching the zipper--other than that just make sure it fits well, no need to slide it on and off except at the foot.
If you're using stretch fabric, it's probably best to just pin the fabric snugly around your leg from the start and use that. Muslin is very stiff so it won't behave like the stretch fabric will.
If any changes are made I like to retrace along the pins--in a different color. Then cut off any extra fabric but leave some room for seam allowance.
The pattern should create two pieces for each leg (a total of 4). Don't worry about the bottom of the foot for now. Transfer this to the final fabric and cut that out. If you're boot covers are like mine where the sides are different from one another, make necessary changes either to the mock-up or on the final fabric before cutting. If the sides are different then you should have 2 different mock-up pattern pieces, making one of each for each leg (a total of 2 of each).
Sew all your pieces together, finish your seams and your hems and you'll be done with this part. Remember leave the top and bottom open.
For the bottom part of the shoe these are multiple ways to do this. You can trace the bottom of the shoes onto the fabric, give seam allowance and attache that to the rest of your boot covers--probably best for flats. I've seen peoples sew it like socks, so you just sew the entire thing at the foot shut---works best for stretch fabric.
What I did was trace the arched part of the heel--a rectangle shape--and sewed that onto only one side of the boot cover. On the other side of both that flat and the boot cover I added a thin Velcro strip. So I'll be able to put the boot covers on then Velcro it at the bottom for security.
If your boot cover needs help staying up, you can use fashion tape or tights like what I did. I used black tights because that's what the costume called for, but for those with skin showing nude tights will work. Put on the tights, then the shoes and then the boot covers. Make sure both boot covers are even and in the correct place and pin the boot covers to the tights, along the top. I decided to hand-sew the boot covers onto the tights--when I tried to take it off and then sew it, it wouldn't stretch the way it needed to when worn again. So just be careful when hand sewing, although pricking yourself a few times is probably unavoidable--the pain of cosplaying. I only sewed along the highest point of the boot covers. You can sew all the way around if you want, but it's very difficult, if not impossible, to sew anything behind you. If you really want to, I suggest getting someone to help you.
I had also added all of the details onto the boot covers before sewing anything to the tights.
And that's how I made my boot covers. I hoped this explained everything well enough and is able to help some of you cosplayers out there! :)
~Positive outcomes only! :)
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