I have a Milt Sparks Axiom holster and a 1 1/2 inch Beltman gun belt. It lets me carry a 45 pretty well, and I'm 5'3".
The cant of the holster needs to be just right for me, to get the grip tucked in against my waist, and tight under my "Lats".
With a loose, long, dark colored pullover, or an untucked, heavy, flannel shirt over a T-Shirt,...you'd be surprised what you can carry.
You need to try on several TOP QUALITY holsters with a good gun belt.
I don't carry my full size 45 often, but when I do the Axiom works great. Some people really like the Milt Sparks Versa Max, for Inside waistband carry.
Others like the Com Tech Kydex holster.
The belt has SOOOOOO much to do with it. Invest in good carry gear.
Even then, you might find the big 45 too much to carry, and go to pocket carry with a good Smith J frame. I find that most effective.