Brassier is commonly known as Bra. Bra is usually used by women as an undergarment. It has an important role in developing and shaping their breasts. It provides a support to woman’s breasts. So the breasts become more shaped. At the age of 11 to 14 girl’s breasts starts developing. In this stage every girls starts to were Bra. This provides a support there breasts. Bra can be worn to support and enhance breast shape during everyday activities. The bra may also be worn to preserve modesty or to present a certain image of femininity. Bras are typically designed to lift the breasts into a particular position. These roles are sometimes conflicting. Some designers aim at producing a garment that fulfills a practical role as well as making it looks attractive. Bras are also used during pregnancy when breasts are enlarged and more sensitive and for nursing to support and provide access for breast feeding.

A brassiere usually consists of two cups for breasts (for hold the breasts), a centre panel (to connect the cups) , a band running around the torso under the bust, and shoulder straps. There are also Bras that do not have strats, called strapless Bra. Bras are typically made of materials like cotton or polyester. Spandex and lace may also be used for various parts of the bra. The cups may be come with various sizes and styles. Strapless bras typically rely on support using underwires.The bra is usually fastened with a hook fastener on the band, typically at the back. In some bras the fastener is in the front, between the cups. Others are pulled on over the head and have no fasteners. Some bras cup contains pads, designed to increase comfort and to conceal the nipples through the material, and also help to provide a good shape to breasts.

Bras have a major role in developing woman’s breasts. So there are some important things to notice before wearing Bra. The bra will perfectly  fit for anyone that wears.

There for a correctly fitting bra should have the following features:

When viewed from the side, the underband should be horizontal, should not ride up the back, and should be firm but comfortable. The underwires at the front should lie flat against the sternum (not the breast), along the infra-mammary fold, and should not dig in to the chest or the breasts, rub or poke out at the front. The breasts should be enclosed by the cups and there should be a smooth line where the fabric at the top of the cup ends. There should not be a ridge or any bulging over the top or sides of the cups.

 Most girls don't wear bras that fit properly and not only are that uncomfortable, but it isn't healthy for your body. Just going shopping and trying on a bunch of bras isn't a smart move either. Before you hit the mall, you need to take your measurements so that you can find the perfect fit.

1.) Try to get your Mom or a friend to take the measurements for you. I know this sounds embarrassing, but it's important. The measurements should be more accurate with someone else helping because your posture will be more relaxed and natural.
2.) Stand up straight and breathe normally.
3.) Don't measure over the top of clothing, or if you do, make sure it isn't bulky.
4.) Wear the bra you feel most comfortable in.
5.) Use a cloth tape measure if possible. Remember, older flexible tape measures can sometimes stretch and distort over time.

 1.) Measure around the chest directly under the breast at a constant height with the cloth measuring tape. (If the bra size works out to an ODD number go up one inch to the next EVEN number.)
2.) Now measure around the chest at the height of the fullest part of the breast. The measuring tape should be held horizontal, flat on your back, and your arms should be down. Make a note of that measurement.
3.) To determine the proper Cup Size, find the difference between step 2 and step 1 (step 2 - step 1.) Use the chart below to determine your Cup Size.

 Half Inch Difference = AA Cup
One Inch Difference = A Cup
Two Inch Difference = B Cup
Three Inch Difference = C Cup
Four Inch Difference = D Cup
Five Inch Difference = DD or E cup
Six Inch Difference = F Cup
Seven Inch Difference = G Cup

Step 1: Under bust measurement is 34".
Step 2: Fullest part measurement is 37".
Step 3: 37 - 34 = 3" difference. Cup size is C.
Result: Buy a 34C bra.

Once you know your bra size, it is off the mall to shop for the right bra for you. Try several different styles (underwire, padded, demi, push-up, full coverage, etc.). The style of bra you choose depends on your personal comfort and what you want the bra to do for "the girls." Make sure when you are trying on bras that you put your shirt on so that you can see how the bra will look under your clothes. The style of bra may look cute on its own, but under your shirt, it may give you a shape you don't like.