All right.
i have perhaps some useful input.My english is iffy,but i hope this makes sense.
I am a 34 F and they are not natural so even with maximum safe compression i cannot get totally flat,so i also rely on camoflage.
Any good binders,like underworks compression,or even making your own out of 4 way stretch lycra.I made mine 6 inches smaller than my bust and "sleeveless shirt style"But i had one from underworks works great too!i have never tried the walmart ones but they look like if you get a small size they might work.
Gauze wrapped tight but not too tight with medical tape taping it in place,thoroughly will usually hold and it will absorb sweat as well.if you use straight up tape,paper tape medical tape seems to be the least harsh to skin,other medical tapes that are harsher i have seen tear off skin.so look for gentle medical tape.i still suggest a thin layer of gauze though.
and while if your bust is not natural you cannot get super flat,i reduce from an F to about a C usually 4-5 inches,so it is possible to compress and camouflage any boobies.
i have heard of smaller busted people cutting a hole and the legs off control top panty hose and using it for compression.when i saw the results it looked great!
i promise its true
i also bind my butt and hips,you know those "control" capri/shorts things you can buy in the panty hose section?they compress butt and hips great!,a couple layers of control panty hose will flatten too.
this had so many pages i only skimmed so i am not sure if all of this was covered.i hope it had some helpful tips in it,and as you can see in the comparison,it really works fairly well.
Example:
girl me:
clearly not a man body,have to hide lots of stuff.
guy me:
[the nuada]with camouflage and a home made compression shirt it might not be perfect but it works wonders! and for the hips i had on the control shorts i described above,it flattened it enough to hide it.the lovely woman in the pic of course many of you know,she made both of these beautiful costumes