It would depend where you buy clothes from. Go to first unread. The women's sizes come in 8,10,12,14 etc
The reason you need to take the supplement on schedule every day is so your body gets used to it and can use it effectively. You want to take it first thing in the morning with a glass of water and a meal. This helps your body get used to processing it effectively to reap the maximum nutritional and metabolic benefits from the extract. Here is a wikipedia page about Garcinia Cambogia.
A inch waist equates to a size 32 in women's jean sizes. In regular women's US dress sizes, however, a inch waist is usually somewhere around a size 14 or XL, depending on the manufacturer and cut of the clothing. Not sure because women are shaped differently to men. For example a 32" waist for women is usually a size 14 BUT women tend to have more of a waist/hip ratio hence you may actually fit a woman's size 12 or even 10 for the hips/thighs but get a muffin top because they are too tight around the middle. For example, if you have a jeans size 36/32, the number 36 means that you have a waist width of 36 inches. The number 32 then corresponds to a leg length of 32 inches. 1 inch corresponds to cm. Before measuring your pants, take a pair of jeans and place them flat on the floor.