If you're going to take your time to stitch something beautiful I think it's worth using a great quality cotton fabric like this Kona cotton by Robert Kaufman. You can get it in a fat sixteenth (approx. 25x28cm) which is the perfect size for a 20cm (8") hoop or a fat quarter (approx. 50x57cm) for larger projects. If you need a larger piece, by ordering 2 fat quarters you will get 50x114cm, 4 fat quarters will be 100x114cm etc.
Colour: Natural (has a natural, unbleached fleck in it)
Content: 100% cotton