Unstitched Fabrics 

By knowing formal things about fashion. The basics of fashion like, What are the good things about most particular clothing brands and what are flaws about certain types of clothing material. By understanding what designs last longer then others and what types of clothing doesn't, you can say informative things in a speech about fashion naturally because you know what clothing are the best to wear based on the way its made and what you see on that design of clothing. You can see which clothing would be better to buy or wear because you know which clothes are most put together as in the type of material of clothing of the color not bleeding out when washed and by seeing which clothes are well stitched together so it doesn't fall apart fast like most clothing does.