Do not use a metal measuring tape such as is used in construction it will be inaccurate. It is better to wear fitted clothes when measuring.

Sizing Sport Obermeyer
How do you take body measurements for clothes. The best practice would be to wrap the tape around the area of the body that you are measuring and gently hold it in place. You will want to use a soft cloth or flexible plasticrubber tape measure such as is used in sewing. Put on the right undergarments and a thin layer of clothing. Once you get a grip on your proportions you can and should consult it to ensure you arrive at the perfect fit. Place one end of the tape measure at the fullest. While you can take measurements against bare skin you can choose to slip on a thin layer of clothing.
A bust measure the bust at the fullest part. It helps to bend side to side to identify exactly where to measure. It will be perfect if you can wear lingerie you intend to wear with the. A lightweight t shirt or tank top are fine as are leggings or even skinny jeans. Make sure to keep the tape measure horizontal and dont pull to tight or hold your breath while measuring. Put one finger between the tape and your body before you measure.
This measurement is used. B waist measure the waist where the body bends. Bras are sized using a unique system based on two measurements of the bust area. Beneath your clothes different undergarments will result in different body measurements. What you should measure chest or bust. How to measure your body the person being measured should stand straight on both feet feet some 15 cms apart.
You can put an elastic band around the waist to mark the correct placement. Twenty tees viscose lycra tank dress 98 in black. You should hold the tape in such a way that you can put a finger between the tape and your body this will ensure your clothes will have some breathing space and a comfortable fit. Measure all around the body total circumference. A soft tape measure like the ones used for sewing a pencil and paper for notes underwear and a bra so measurements are more accurate a can do attitude. This is measured between your groin and your lower ankle.
This can skew the measurements. Use the correct type of tape measure. This measurement is used for tops and dresses. Put the tape around your natural waistline which should be close to your bellybutton. When taking body measurements you need to use the correct type of tape measure. Absolutely no baggy clothes.