Bra size

It is a combination of both breast size and body sized.

If a lady wearing 36" bra size age of 26, she is 5-1/2" of height and little fat too. let me know are her breast too big or normal.

You have not provided enough information

A bra size consists of two parts, a number and a letter. The number is an indication of chest size and the letter is a measure of the actual breast size.

eg 36DD is a larger woman with a large breast size.

Just don't wear bras. They are unnecessary. Mine look great naked and I haven't worn a bra ever.

To figure your bra size you measure around your waist, just below your breasts. Add either 5 or 6 to that number, whatever makes it an even number. Then measure around your bust. The number of inches difference in the two numbers is your cup size. 1 inch = A cup, 2 inches = B cup... 4 inches = D cup, 5 inches = DD cup and so on. It is estimated that over 60% of women are wearing the wrong bra size because they either haven't measured correctly or are unsure of how to measure properly.

A person wearing a 36DD bra would have a rib/chest measurement of 30" around and a breast measurement of 42" around. The first number can be indicative of someone's body type, but the cup size ( the letters) are purely related to the breast size.