I highly recommend that you use a professional seamstress in your area. Accurate measures ensure fabulous results! Having odd/rare results are a red flag to bad measurements. It is very hard to get accurate measurements on yourself.
*While having your measures done wear the undergarments that you will wear with your garments. Spanx and padded bras change your shape and alter your measurements.
Absolutely never ever wear a sports bra during measures!
*Wear the heels you will wear with your garment if you have a floor length item
*Stand up straight during measurements but relaxed. Pay attention to your shoulders and that you are not sucking in your stomach.