Sentence:  The visitor was about fifty-two years of age, dressed in one of the green surtouts, ornamented with black <WSD>frogs</WSD>, which have so long maintained their popularity all over Europe. 
Meaning of the word marked with <WSD> tags:  An ornate fastener for clothing consisting of an oblong button (covered with netted thread), toggle, or knot, that fits through a loop.