Button Hole

[lcbaer]

I'm working on a sweater that has two button holes in the placket/collar. The instructions for making them is just a yo, k2tog leaving a hole for the button. This disappointed me as i was hoping to use nice big buttons for this sweater... adding my own personal touch. I've made button holes before using the bind off/cable cast on meathod before but only in st st. The pattern i'm knitting in is 1x1 rib. Do i need to do something different to get the button holes i want? or should i just leave it a lone and live with tiny tiny buttons.... ?

Thanks!!!