If you would like to eliminate the zipper, then using stretchyer material would be good. But if the stretch material isn't stretchy enough, try using an invisible zipper. and run it along the seams in the back, if its a 4 panel skirt. I think that the stretchy material would be better for this type of skirt. I made a lightning cosplay not too long ago, and the skirt wasn't stretchy enough. I need to find something stretchier.
Also for the suspenders, I would try to find the clips at a joanns, or a micheals. Find 4 small suspender clips. From there figure out how they work and add on a cording for the loop this cord should be able to stay up on its own. The suspenders on that cosplayer, the loop seems to be threaded thru the bottom of the suspenders. If not possible for your suspenders. I would add a belt loop-like piece of fabric on the back side of the suspenders, and gorrilla glue them on, or sew them, if you have a good sewing machine. DO NOT USE HOT GLUE. I've used it plenty of times and on slippery fabrics, it just comes off.
Sorry for such a long post. I just hope I helped.
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