Ne'er cast a clout ...

Ne'er cast a clout ..., originally uploaded by Rhian vK.

.. till May be out.



The hawthorn is also known as the May.



So does this proverb mean 'Never discard your (warm winter) clothing until

the month of May has finished?



Or until the May is out in blossom?



In French there is:

En avril, ne te découvre pas d'un fil; en mai, fais ce que tu veux.