You need to be wearing a bra to measure your bust. Then wrap some soft measuring tape around your torso directly under your bust where your bra band is. In order to find the right size bra you will need to take your measurements. If you are going to wear a bra with the garment you should measure with the bra on otherwise the garment wont fit right. The bust size is the loose circumference measured around the chest over the fullest part of the breasts while standing straight with arms to the side and wearing a properly fitted bra. Stand upright without a bra on and using a measuring tape measure around your back and under your bust where the band of a bra would usually sit.
Pick a comfy one but one that doesnt boost your bust size. Remember there are 2 bra measurements. The hip measurement is supposed to be 7 inches below the waist but since peoples bodys are a little different to be sure just measure at the place that is the largest below the waist. If its odd add 5 instead. Finding the perfect fitting bra starts with knowing your correct size. Make sure the tape is going around in a steady even line.
To measure your bra size first stand in front of a mirror with a non padded bra on. According to research as many as 75 of women wear the wrong size bra. You want to measure your actual breasts not the extra padding. If its an even number that is your band size. It should feel snug but not tight. Next measure loosely around the fullest part of your bust.
The band or frame size is the firm circumference fitted not tightly measured directly underneath the breasts. Put on a bra. Use the following to convert the bra sizes betweem different locations. If this measurement is even add 4 to get your band size. And if you wear a plus size bra it can be even harder to find a bra that fits.