When I first got my colostomy, I tried several different types, and one and two piece pouches thanks to the help of a great ET nurse.
They come in many different styles and sizes, it is ok to test drive different ones around, but stay with the cut to fit for a few months till your stoma shrinks and you find out what size it will be. Talk to your ET, get free samples from them and you can as the different companys to send you some samples.
Me I prefer the one piece drainables from convatec.
I made a cloth pouch cover for mine since it hangs down right where my belt line is, that why I am more comfortable knowing if I reach up for something my bag dont show. I came up with it since my wife can stand seeing my poo poo.
* I think it may be time for a colorful metaphor*