I want to make a patchwork quilt & have bought some very pretty tilda charm packs for the job. However, am a complete novice & have a (probably) dumb question: Fabrics usually come in a standard width of 140cm, so how do I get a piece big enough for the reverse of my quilt? I want to make it for a double bed & looking at ones you can buy online, needs to be approx. 170-200 x 200cm. Do I have to stitch 2 pieces together, or can you buy wider fabric for the job & if so, where?