Making and selling items from these fabrics and patterns is perfectly legal. But the companies want you to think it's wrong and will make your life miserable and send threatening letters. However none have won in court. It's just a matter of if you want the hassle. Some etsy crafters have sued the big companies when they tried to shut them down and even Disney settled out of court. But if they see your items they will send nasty letters and threaten to sue you.