Typical buttons are bought, just like the cloth. Rondyvooers like rustic buttons, but that does not make them historically correct or typical.
Most shirts used Dorset buttons. They are made of thread.
Next, MoP, white glass (I handled a c. 1800 original that had 2-hole white glass buttons) or bone..
For 1820's/30's 5 hole bone would be a good choice. The main thing is, though, size. Shirt buttons then were no bigger than shirt buttons now. 3/8" not 3/4"
Unless you wanna look like you are wearing Pajamas... :rotf: