Just a repost today, as I went to a wedding at the weekend, and am still deep in finishing The Book.
In Medieval wedding services the wife would promise the following:
I take thee, John, to be my wedded husband, to have and to hold, from this day forward, for better for worse, for richer and poorer, in sickness and health, to be bonny and buxom, in bed and at board, till death do us part, and thereto I plight thee my troth.
Now, this seems to our modern eyes to be a strange sort of promise. How could a wife guarantee that she would be buxom? Were thin women unable to marry in church? However, the word buxom has changed in meaning over the years. The first citation of buxom in the OED comes from the twelfth century and is defined as: Obedient; pliant; compliant, tractable. The sense then changed to happy, then to healthy, and thence to plump.
Meanwhile bonny comes from the French bon and the Latin bonus, both of which mean good. So a bonny and buxom wife was a good and obedient one, which is why it was eventually replaced by loving, honouring and obeying. There's even a sixteenth century reference to being "bonnaire and buxome to the Pope".
Anyway, this form of the service is still occasionally used. There's a story about it here.