Buying something without rying it on can be very stressful, so it is important to know your measurements. Not know your bust size can mean you purchase a garment that does not fit. Remember that what bra size you wear does not correlate to your bust size.
When taking your measurements, always use a cloth measuring tape*. For the most accurate results, have someone else measure you. Also, make sure the tape measure is held snugly and firmly but not tight against your body and is always parallel to the floor for circumference measurements.
Remember to wear proper undergarments. If you wear a special support bra for riding, your measurements should be taken with that bra on.
The morst inportant measurements for showfancy jackets are D-bust, E-waist and G-hip.