That will make it very loose and sloppy then.

Hi Tan! If you can already sew then you are half way there You can get some free patterns if you browse about on nappycino. There are a few you can buy also such as Very Baby or Honeyboy which come with very detailed instructions.
Get some cheap fabric for your first couple of attempts. ie old flannel sheet or towels. No point in wasting the good fabric till you're sure what you're doing

Where do you live?