long, baggy knickers for men, introduced before World War I and worn until the 1930s for sports activities, especially golf.
so called because four inches are added to the length of ordinary knickers to give the desired looseness
men's baggy knickerbockers reaching below the knee, now only worn for hunting, golf, etc
[C20: so called because the trousers are made with four inches of material to hang over at the knee]
Collins English Dictionary - Complete & Unabridged 10th Edition
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