Tip for your pattern picking
According to some of the reupholstering experts, one of the most common errors people make is choosing stripes for chairs with a round seat. Although you can do it, particularly if you want to, it doesn't always look the best once it is put together. While there is no harm in taking apart the chair again and switching the fabric, you can start to damage the chair if you take it apart too much, especially if it is an older chair.
For rounded seats, the only issue with stripes, and often particular designs, is that the shape can get a little bent as you spread the cloth to staple it. It might look good at first, but you will note how crooked the stripes are once you have the final product.