Mighty Oak -
I've been an incurable predator hunter since the mid 50's. After decades of calling and hunting predators with modern laser guided missile launchers (and for some of those years wearing camo), I went back to doing so with my sidelock's and freetrappers clothes about 5-6 years ago (as I did in the early 70's when I first started shooting black). So far have only taken badger, fox and coyotes since I went back to the sidelocks, but they would work equally well on cats and lions if I bothered to get tags for them. Prefer my two 36's but have used some of the 45's as well. I carry a 45 sidelock pistol for chances at doubles. There is no need for anything bigger, and bigger holes just means more sewing. The 32's are better saved for small game or no more than the smallest predators up close. I've always only used mouth calls I made myself. Within range the sidelocks and maiden gear can work just as well as any of the modern firearms and modern doodads. I have missed some longer running shots, so still not as good with the sidelocks as with the modern rigs on the runners. But if you can call them within range for and shoot reasonably well with your MLer, you will eventually score.
IMO camo is just foofarraw for any kind of hunting, and not necessary. Breaking up your outline can easily be done with the cover at hand while still or spot and stock hunting. Western fox are pretty dumb and will even remain around after seeing/winding you if you stay on your call or lip squeak them, sometimes even after a missed shot. Dumb! It's believed that the canine predators can't see colors beyond shades of gray, pale yellows and pale blues. So more stands are busted by them because of movement on your part or them getting your wind, and not whether you are wearing camo/cover scents or not. Never saw a need for cover scents myself - more foofarraw. Setup is the key to success in predator calling, and that includes knowing the travel lanes, having the wind and sun in your favor, then being able to stay motionless.
BTW, a neat trick to stay away from using anything modern when you want a decoy is a simple feather or fluff on a string tied to a handy branch upwind of you. That's enough when they get closer to take their attention off the source of the sound (you) and direct it someplace else. Up wind because most coyotes circle downwind to some degree when coming to a call, and that puts them right in front of you. Big help if you have to move to bring a firearm into battery and you can't catch them "looking the other way", and to hopefully have them come in without getting your wind. And another BTW, coyotes almost always stop to a look back with a loud bark or two if not spooked too much. If still within range when they stop, that may still give you a high percentage shot at them.
As those that have been successful hunting other kinds of game with their sidelocks will attest, not much is more satisfying and all are a trophy. But if you want an even bigger challenge and gratification calling predators, leave the sidelocks at home and go after them with a long bow and cedar arrows. Either way, pitting your skills one on one against a coyote with any primitive weapon will net you a trophy you will be hard pressed to surpass.
Good luck, stay at it and you'll eventually make fur.