The process of making changes to pattern which has been entirely sewn out or article of clothing to create a better fit for the wearer. Some of the methods of alteration include:

• Hemming
• Taking it in
• Changing the size in anyway

An example of when altering clothing is altering stock costumes to fit a variety of cast member. Methods such as adding seams, letting out seams, and taking in seams can allow for a stock costume to gain a custom fit. By altering a garment, the article of clothing it give the garment the ability to be fitted ‘just right.’