The compound adjective 'well-fitting' is a transparent combination of two English elements. The adverb 'well,' with its ancient Germanic roots conveying goodness and suitability, intensifies and qualifies the participle 'fitting.' The verb 'fit' itself, emerging in Middle English, carries a core sense of being appropriate or suited. When combined as 'well-fitting,' the term logically builds its meaning from the literal sense of "fitting in a good way" to specifically describe garments that conform to the body's shape both comfortably and aesthetically. This evolution exemplifies how English readily creates descriptive compounds by combining native, functional morphemes.

Structure: well (adverb) + fitting (present participle) - well: From Old English wel, meaning "in a good way, suitably, properly." It functions as an adverb modifying the participle. - fitting: From the verb fit, of uncertain origin, possibly from Middle English fitten meaning "to be suitable." The -ing suffix forms the present participle, which functions here as an adjective.