? 
It is great pleasure of mine to educate my fellow "non-white" Nepali about all his half baked knowledge through the first results on google search (which normally leads to Wikipedia).
So here is something about shirt:
"....The world's oldest preserved garment, discovered by Flinders Petrie, is a "highly sophisticated" linen shirt from a First Dynasty Egyptian tomb at Tarkan, ca. 3000B.C. : "the shoulders and sleeves have been finely pleated to give form-fitting trimness while allowing the wearer room to move. The small fringe formed during weaving along one edge of the cloth has been placed by the designer to decorate the neck opening and side seam."[1]
The shirt was an item of men's underwear until the twentieth century.[2] Although the woman's chemise was a closely related garment to the man's,[3] it is the man's garment that became the modern shirt. In the Middle Ages it was a plain, undyed garment worn next to the skin and under regular garments. In medieval artworks, the shirt is only visible (uncovered) on humble characters, such as shepherds, prisoners, and penitents.[4] In the seventeenth century men's shirts were allowed to show, with much the same erotic import as visible underwear today.[5] In the eighteenth century, instead of underpants, men "relied on the long tails of shirts ... to serve the function of drawers.[6] Eighteenth century costume historian Joseph Strutt believed that men who did not wear shirts to bed were indecent.[7] Even as late as 1879, a visible shirt with nothing over it was considered improper.[2]
The shirt sometimes had frills at the neck or cuffs. In the sixteenth century, men's shirts often had embroidery, and sometimes frills or lace at the neck and cuffs,[8] and through the eighteenth century long neck frills, or jabots, were fashionable.[9] Coloured shirts began to appear in the early nineteenth century, as can be seen in the paintings of George Caleb Bingham. They were considered casual wear, for lower class workers only, until the twentieth century. For a gentleman, "to wear a sky-blue shirt was unthinkable in 1860 but had become standard by 1920 and, in 1980, constituted the most commonplace event."[10]
European and American women began wearing shirts in 1860, when the Garibaldi shirt, a red shirt as worn by the freedom fighters under Giuseppe Garibaldi,[11] was popularized by Empress Eugénie of France.[12] At the end of the 19th century, the Century Dictionary described an ordinary shirt as "of cotton, with linen bosom, wristbands and cuffs prepared for stiffening with starch, the collar and wristbands being usually separate and adjustable"...."
And here is something about trousers:
"Trousers first enter recorded history in the 6th century BCE, with the appearance of horse-riding Iranian peoples in Greek ethnography. At this time, not only the Persians, but also allied Eastern and Central Asian peoples such as the Bactrians, Armenians, Tigraxauda Scythians and Xiongnu Hunnu, are known to have worn them.[5][6] Trousers are believed to have been worn by both sexes among these early users.[7]
The ancient Greeks used the term "ἀναξυρίδες" (anaxyrides) for the trousers worn by Eastern nations[8] and "σαράβαρα" (sarabara) for the loose trousers worn by the Scythians.[9] However, they did not wear trousers since they thought them ridiculous,[10][11] using the word "θύλακοι" (thulakoi), pl. of "θύλακος" (thulakos), "sack", as a slang term for the loose trousers of Persians and other orientals.[12]
Republican Rome viewed the draped clothing of Greek and Minoan (Cretan) culture as an emblem of civilization and disdained trousers as the mark of barbarians.[13] As the Empire expanded beyond the Mediterranean basin, however, the greater warmth provided by trousers led to their adoption.[14] Two types of trousers eventually saw widespread use in Rome: the Feminalia, which fit snugly and usually fell to knee or mid-calf length,[15] and theBraccae, a loose-fitting trouser that was closed at the ankles.[16] Both garments were adopted originally from the Celts of Europe, although later familiarity with the Persian Near East and the Teutons increased acceptance. Feminalia and Braccae both began use as military garments, spreading to civilian dress later, and were eventually made in a variety of materials including leather, wool, cotton and silk.[17]..."
And here is something about coats:
"The Persians, based in what is now Iran, introduced two garments to the history of clothing: trousers and seamed fitted coats."
Well, now your supremos whites didn't seem to "invent" the thing you are wearing right now , my question is would you start worshipping Egyptians, or Persians from the east. :-)
Also on side note, I am not trying to say easterners are better than westerners and vice versa, I am just trying to help you think clearly and research some before making a point. Also accepting your mistake does not make you loser, but it makes you better debater for future reference.
P.S.- I wonder if they have not found not so inventive cotton garments, I wonder if they will still be wearing woolen clothes in summer? :-)