belle (n.)youdaoicibaDictYouDict[belle 词源字典]
"beautiful woman well-dressed; reigning beauty," 1620s, from French belle, from Old French bele, from Latin bella, fem. of bellus "beautiful, fair" (see bene-).[belle etymology, belle origin, 英语词源]
dap (n.)youdaoicibaDictYouDict
fist-bump greeting, with various theories as to origin and name meaning. In U.S. popular black culture by 1972 and controversial during the Vietnam War when used by U.S. soldiers, as it often was regarded by whites as a ritual act of black solidarity. Probably imitative (dap was used in 19c. for the bounce of a ball or the skip of a stone on water). Dap, meanwhile, is listed in the DAS as black slang c. 1950 for "aware, up to date," also "stylish, well-dressed," in the latter case at least a shortening of dapper.
fashion (n.)youdaoicibaDictYouDict
c. 1300, fasoun, "physical make-up or composition; form, shape; appearance," from Old French façon, fachon, fazon "face, appearance; construction, pattern, design; thing done; beauty; manner, characteristic feature" (12c.), from Latin factionem (nominative factio) "a making or doing, a preparing," also "group of people acting together," from facere "to make" (see factitious).

Especially "style, manner" of make, dress, or embellishment (late 14c.); hence "prevailing custom; mode of dress and adornment prevailing in a place and time" (late 15c.). Meaning "good style, conformity to fashionable society's tastes" is from 1630s.
To call a fashion wearable is the kiss of death. No new fashion worth its salt is wearable. [Eugenia Sheppard, "New York Herald Tribune," Jan. 13, 1960]
In Middle English also spelled faschyoun, facune, faction, etc. Fashion plate (1851) originally was "full-page picture in a popular magazine showing the prevailing or latest style of dress," in reference to the typographic plate from which it was printed. Transferred sense of "well-dressed person" had emerged by 1920s. After a fashion "to a certain extent" is from 1530s. Shakespeare (c. 1600) has both in fashion and out of fashion.
spiffy (adj.)youdaoicibaDictYouDict
1853, of uncertain origin, probably related to spiff "well-dressed man." Uncertain relationship to spiff (n.) "percentage allowed by drapers to their young men when they effect sale of old fashioned or undesirable stock" (1859), or to spiflicate "confound, overcome completely," a cant word from 1749 that was "common in the 19th century" [OED], preserved in American English and yielded slang spiflicated "drunk," first recorded in that sense 1902.