Especially talented:

The shape of a woman’s breasts is different. Make an individual blind and go with it for a gift.
And if you are serious, get a friend more or less a new underwear and come with it to a good specialized store. Probability of pleasure increases
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No need to pull anything. Take a bra and read the size on its label. There will be no label - look at another bracelet. Somewhere to find.

In the end, just ask the girl, she will still be happy when she gets a gift.
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The shape of a woman’s breasts can vary even within the same size. Or do you think that the sample in the underwear store is solely for what to determine whether the lady has a particular whirlwind or not?
An experienced seller will be able to pick up roughly the same underwear in size and size.
Did you think that only jeans of the right size can not fit on the figure?