How many borders are you adding? 1 inch may not seem like much for only adding 1 border but that inch can "grow" the more borders that you add. I was taught to measure from the center and that is the length of your border. In fact I only measure the center ONCE and use that measurement to cut the borders. I then match centers, 1/4s and ends of border and top and ease in any excess BEFORE I sew. Also put piece that is too large on the bottom next to feed dogs so they will help ease in any excess. You can also gently stretch the bottom fabric to fit but try to do it eavenly. You can also "shrink" the excess part by spraying well with water and let that dry and fabric should shrink a little Again thart 1in does not seem like lot but borders cut WOF will stretch a little so your 1" too big border can become several inches too big by the time you are done. This may seem picky but as a quilter I try to do the best I can which is not usually perfect.