There are usually a number of ways to alter clothes.  The quick and easy method is with darts.  If you want to do it properly you would sew the darts separately which means unpicking at the seams where the dart will go.  Sometimes it difficult to get into these areas, because they may be encased.  […]

If you need a dress or gown hemmed, but you also need the straps taken up, pin the straps BEFORE you pin the hem.  This way you will get the right length.  If you pin the hem, then pin the straps, the hem will get shorter.
 Happy sewing
Judith aka genie