If you are a raw squatter, chances are, unless you are built like Gimli, you will do well with some oly lifting shoes like the Nike or Adidas or similar. Use them for bench as well to help drive into the toes.
I use the Metal deadlift shoes and they are epic. You can squat in them as well if you don't do well in the oly shoes. Slippers and bare feet offer no outer foot support and sometimes pushing out will help you get a lift.
If you are on a budget, the raptors look OK or Chucks. I use a similar looking Asics wrestling shoe for general gym wear.