And one more question today.
In the chapter "When to send flowers" there are tips what flowers and when to send or not to send. An the last sentence:

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Finally, a gentleman knows that unless a woman is a grandmother of the bride, he never sends a corsage.
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Corsage is "a single or small spray of flowers attached to woman's dress or wrist" or "bouquet, arrangement of flowers given as a present".
Does it mean that a man never sends a bouquet of flowers to anyone except to a grandmother of a bride?? Or maybe the small size is implied, and he may send big bouquets to other women, but small corsages only to grannies...?!

In America, corsages are not all that common, with the exception of special occasions such as weddings, Mother's Day, maybe birthdays. I guess he's implying that a bouquet be sent.

Could it be, in the context, that a corsage is generally a sign of interest from a young man to a young woman? The way it is worded, using the term 'gentleman', makes me think that its advice to keep one from appearing inappropriate.

It means that a corsage is not a suitable offering to anyone except a lady such as the grandmother of the bride.It is a small, token, gift. If he is sending flowers to his hostess or when romancing he would choose a bouquet or an arrangement. He might, just, think to have a corsage made for his companion to take and pin to her dress at a ball or formal dinner but I can't think when otherwise it would be thought appropriate (in England even that would be unusual, though on the Continent it still happens)

Thank you!