It is important to find the grainline so things fit right. Unless your pattern specifies otherwise, your pattern pieces need to be be cut on the lengthwise grain. Make sure your fabric drapes properly by finding the grain – use this method to quickly test one corner by pulling a thread.
Losing your buttons? Use a drop of clear nail polish to keep threads together and buttons on longer. I love using this on clothes which get extra use – perfect for baby clothes, too!