Doublet (noun)

1. A man's close-fitting jacket worn in the 16th and 17th centuries, typically made of velvet or satin and padded and quilted to provide protection against weapons.
2. A word which is the same or very similar to another word in the same language, but with a different origin or meaning.

Origin:

Middle english: from old french doussette, diminutive of dous "douce" (see sweet). the original sense was "a man"s close-fitting jacket", later "a man"s padded and quilted garment worn as a protection against weapons".

Examples:

1. He wore a red velvet doublet to the banquet.
2. The doublet was a fashionable item of clothing in the 16th century.
3. The doublet was worn over a shirt and hose.
4. He wore a doublet and hose to the Renaissance fair.
5. The word "dove" and "diver" are doublets.