Can I buy a jumpsuit pattern?

There are lots of free hat patterns on Ravelry. You can also just search "Beanie button hat free pattern" on an internet browser and it should show up.

Yes, it is your opinion to do whatever you want since it's your drawing.

You can cast on more stitches, but it might not work as well.

Increase on the end of rows, and keep that increase in mind when you start the next row.

Jumpsuits would not work really well. Cardigans and khaki pants would work fine.

It's best to cut a pattern with your measurements first so that you properly cut your fabric. You don't want to accidentally cut your fabric too small and end up...

If you turn off the spiral towards the center, you can move your cursor fast around the screen and you can make any design.