Sizes vary between dress manufacturers, so it's not
always a given that if you're an 8 in one dress you'll be that size in
another brand's dress. Knowing your measurements can help you figure out
what size you'll be, as most brands have a measuring chart available to
compare to online.
You can use a cloth tape measure and a full-length mirror to measure
yourself. Getting someone to help you may be beneficial, as you might
not always be able to reach or read the measurements. You should wear dress undergarments
or light clothes when you measure yourself to avoid added bulk. Be sure
to stand up straight and keep the measuring tape snug but not too
To find your bust measurement, measure around the fullest part of
your bust. You may also want to measure around your shoulder blades and
under your armpits depending on what style of dress you're looking to
buy. Next, find your natural waistline and measure that. Finally,
measure the fullest part of your hips.
Once you find your measurements, compare them with your dress brand's
measuring charts and choose the size likely to fit you best. If it's
not perfect, you can always get a good tailor.