At my school it is explained that the WC/WT resemblance to bare knuckle boxing is owed to the fact that a Chinese physician noted that traditional (Northern Chinese) Kung Fu fighters were being bested by Western Sailors using bare knuckle boxing. He copied the basic fighting stances of the bare knuckle boxers and combined the flowing movements of Tai Chi Chuan and Wing Chun was born.
That's a story that's been around for a while, but unfortunately is
just as speculative and historically unsubstantiated as the traditional Chinese origin stories for WC/WT. It is factually known that WC existed pretty much in its current form since the times of Leung Jan of Fatshan (Fo'shan) in the mid 1800's. Earlier than that is a matter of speculation. Still, WC did not spring into existence ex-nihilo. It emerged from the context of Southern Chinese boxing which emphasized narrow upright stances, fast, close-range hand techniques and low kicks. Other examples of this regional approach include Fukien White Crane, Southern Preying Mantis and so forth. What was revolutionary about WC/WT was it's
concept of simplicity and approaches to training. While the other, similar Southern Chinese systems favored numerous, complicated forms and elaborate movements with highly poetic names, WC/WT reduced it's forms to the bare minimum of three, plus the dummy-set and two short weapons sets. Techniques were named for what they were, such as "tan-sau" for palm-up arm. The style was streamlined with the objective of absolute efficiency and practicality. And, perhaps most significantly,
chi-sau evolved to enable a practitioner to "read" his opponent's energy and turn his force back against him. Significantly, there's nothing like
that in Western boxing.
Considering the context in which WC/WT emerged, and in how insular and anti-foreign the
Chinese culture in Fatshan was during the mid-late 19th century, the Western, bare-knuckle boxing connection seems
pretty unlikely, after all. Perhaps a more probable explanation is a simple matter of convergent evolution, ie. adapting to what works in a given situation. Sharks and dolphins came from totally different roots, yet both are streamlined as an adaptation to swimming in the ocean. WC/WT and bare-knuckle boxing resemble each other simply because t
hey both represent a highly practical adaptation to fist-fighting.