E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Cap of Time.
They wear themselves in the cap of time. Use more ceremony, says Parolles, for these lords do wear themselves in the cap of time, i.e. these lords are the favours and jewels worn in the cap of the time being, and have the greatest influence. In the cap of time being, they are the very jewels, and most honoured. (Shakespeare: Alls Well, etc., ii. 1.)