Hitherto, most clothings have been empirically, designed and produced by garment manufactures. This study aims to produce clothings by a scientiffic method “deductive reasoning” considering what clothings should be from the work design's point of view. For this purpose, the fundamental terms expressing visual impressions have been investigated and free curves have been analyzed by one group of the subjects and attempts have been made to generate clothing figures for women on the basis of these curves.
Another group of the subjects judged whether the figures generated above can be recognized as clothings. Fourier's coefficients were calculated to apply the Fourier's series equation to the figures recognized as clothings. Next, periodogram were figured on the basis of those Fourier's coefficients. Then, it should bc possible to reappear the clothing figures generated above by using dominat periodic components in that periodogram.
The computeaided models thus obained include these coefficients as characteristic values with the equation of Fourier's series. Thus, the method has been developed to produce any clothing figure expressing visual impressions.

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Flats were made, which have wire fillet card clothings with wire-sets of 31mm adhered to flat bars of 33.3mm in width.With these flats, the relation between the sliver quality and the inclination of flats and the relation between the sliver qualit yand the flat acting angle were examined respectively.Besides, these newly made flats and ordinary flats with wire-sets of 22mm were compared.
1) These newly made flats with the inclination of 1/37.5 are almost the same as ordinary flats in the amount of neps in the sliver.In newly made flats, the amount of neps decrease as the inclination of flats is made smaller than 1/37.5.This tendency is more remarkable in thecase of 90°of the flath acting angle than in the case of 75°.
2) In these newly made flats, the amout of neps in the sliver is smaller in case of 90°than in case of 75°.
3) In these newly made flats, the mean length of the fiber in the sliver remains same, regardless of the inclination of flats and the flat acting angle.

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