For a large flower, you will need around 12 circles, I used the lid off a tin of Monetta Wafer Biscuits
You can also use the opening on a large tumbler/glass
How much fabric you need depends on how large a circle you are planning to make.
Trace your circles and cut them all out
Fold your circle in half
Fold your circle in half again like above
Fold each corner into the middle, kind of like you are making a paper plane
Fold the 'plane' back on its self and sew through with a needle (best to use upholstery thread)
Your petal should look similar to this
Repeat process as many times for the petal that you require.
(these aren't my pictures from now on so it could look a little different, I will update with my own pictures tomorrow)
Spread the petals out like so
you can then sew the flower together:
you then turn the flower over and you can attach your button, or doily or whatever it is you choose to attach!
happy creating!