Since you often can't return a product that has been worn next to human skin perhaps the companies selling bras have realized that being able to sell more bras

Since you often can't return a product that has been worn next to human skin perhaps the companies selling bras have realized that being able to sell more bras until a person figures out the right size is profit? Just one example of where obfuscating size/quantity/other_parameters is used for profit. For example, a "2x4" is actually 1+1/2 inches by 3+1/2 inches? This has been going on since the time of the Egyptians when you had to bring your own scale to the market to weigh goods, and watch out for the thumb on the scale.