Monday, November 8, 2010

Underwires and the Proper Bra Fit

Every woman who wears underwire bras needs to understand underwire sizing. Breasts have a diameter and a projection. When you select a cup size (e.g. B, DD etc.) you are making a breast projection selection.

Each band size has a pre-determined breast diameter built into it in the form of an underwire. Changing your band size can change the underwire diameter. It is also a fact that the same size underwire is used in different cup sizes - the underwire in a 36C is the same underwire used in a 34D and a 38B cup sizes.

Finding Your Underwire Size:

Find your bra size on the chart below. Every bra size in the same diagonal color stripe uses the exact same underwire size.

Now that you understand underwire sizing, here's how you can use this information. Say you've found a bra that fits you great in the cups, but is tight around your ribcage. You now know that when you go up a band size and down a cup size, you will have the same fitting cup diameter (the same wire will be used) but a larger band. This also explains why underwire swimsuits with just a cup size like a "C" don't fit all C cup women. And, for you analytical types who are probably wondering, the diameter increase between standard underwire sizes is approximately 3/8". A standard underwire's length increase between sizes is approximately 5/8".

Underwire Bras Underwires are designed to have some spring. Made out of heavy gauge wire, sheet metal or plastic, they splay or spread wider once a bra is put on and fastened. Then they return to their original shape when the bra is taken off. This springing or splay gives additional support to your breasts. If your breasts are wider than the splayed diameter of the underwire, over time the pressure and weight of your breasts can cause an underwire to break in half. Wire breakage can also occur if your band size is too small and thus over-splaying the underwires.


30A
30B
30C
30D
30E
30F
30G
30H
30I
32A
32B
32C
32D
32E
32F
32G
32H
32I
34A
34B
34C
34D
34E
34F
34G
34H
34I
36A
36B
36C
36D
36E
36F
36G
36H
36I
38A
38B
38C
38D
38E
38F
38G
38H
38I
40A
40B
40C
40D
40E
40F
40G
40H
40I
42A
42B
42C
42D
42E
42F
42G
42H
42I
44A
44B
44C
44D
44E
44F
44G
44H
44I


Underwire shapes can vary among brands. In fact, lingerie manufacturers claim their underwire grading and shaping to be the secret behind their unique fit. This is why you may find wire variations among manufacturers. This is also why one manufacturer may fit you better than another. Underwires also have different lengths - though their curve will maintain the same shape. For example, demi cup and low-plunge bra styles will have shorter wires. Underwires in petite bras will also be shorter in length to accommodate a shorter torso. Strapless bras tend to have the longest underwires. Since they do not have the benefit of strap support, strapless bras compensate by having more wire surrounding the breast to give more support.

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