Why is a 34C wing smaller than 34B wing?

Whether you are in the throes of grading, designing patterns or are buying a bra and confused by the mystical ways of how sizing a bra works. In this blog we will be looking at the wings, ( I will do a separate blog on cross grading and cups).

So let’s concentrate on wings, on any under-band that is the same size (so all the 32s all the 34s etc…) the wings will be different lengths, so if you are grading a bra, your 34B wing will be longer than your 34C wing.

“Wait, wha? A 34C bra is bigger than a 34B how is this possible?” I hear you cry.

Okay so this is what we know.

You know….

A 34A, a 34B, a 34C (you get the picture) if you put them along a ruler and measured from the hook to the eye they would all measure the same - because they need to go around the ribcage of someone who needs to wear a 34.

On the same under-band a C cup is bigger than a B cup, a B cup is bigger than a A ( and so forth) so because the C cup is bigger than the B cup, this naturally means that the cup takes up more space therefore the wings on the C cup needs to be smaller to compensate for this, for the same under-band measurement.

In the picture you see how this naturally occurs, you realise that it is not wizardry but a natural occurrence when bra sizes occupy the same amount of space, and when one part gets bigger, then the other part has to get smaller to compensate.

In the image you see the bras all laid down together to show that they measure the same along the whole of the bra, and also an image of the side wings are shown on top of one another to show that the wing length changes with each size.


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Often when I am teaching to eliminate actual bras and use objects to teach something as some people can have a block when it come s to bras and think it’s more complicated than it is, on on this weeks YT video I used books instead of bras to get the point across.