Measurements have been made of the human body of babies and the size of baby wears on the market, giving the attention to consumers' complaints that baby wears are often too small for babies and they are considerably tight at body but loose at sleeves and legs. The following results have been obtained.
(1) A measurement of the vertical trunk girth of babies have shown that putting on a diaper increases the vertical trunk girth by about ten certimeters.
(2) Approximate correlations have been found among sizes of portions of baby wears on the market. The nominal size, however, does not always agree with the actual size.
(3) The actual size of some baby wears is smaller than the nominal size. These baby wears are too tight even for babies without a diaper. In particular, they are tight at the vertical trunk girth.
(4) The investigation has revealed that measured baby wears are extremely small at the vertical trunk girth for an average-sized baby with a diaper, inevitably resulting in the excess of chest girth, sleeve length and crotch height.

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In the previous papers, Parts 5-9, investigations were made of the influence of tensile deformation on the change of surface reflection and crimp properties of fabrics, which were fixed to a given extension by using a strechmeter worked by hand, by the two- or three-dimensional goniophotometric method.
This article aims to measure the behaviour of reflection-extension and load-reflection of a fabric at a constant rate extension by using a goniophotometer provided with a stretchmeter with a mini-loadcell which had experimentally been manufactured. Main results obtained are as follows: The behaviour of the reflection-extension is quite similar to that of load -extension curves except for the behaviour at an initial extension. These reflection-extension and stress-reflection properties make it possible to measure the deformation behaviour of the surface caused by extending a filament fabrics.

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This article aims to measure the behaviour of reflection-extension, load-extension and load-reflection properties of filament fabrics caused by repeated tensile deformation by using the same procedure described in the Part 11. The results obtained are as follows: When a fabric is fixed to high extension, the relaxation of surface reflection such as the relaxation of stress has slightly appeared on the reflection-extension curve. The hysteresis has occured on the stress-reflection curve by repeated tensile deformation, and the stress recovers faster than the reflection does. The intensity of regular reflection increases with repeating cycles. It is possible to measure the deformation behaviour of filament fabrics from both the mechanical and surface properties by these optical and mechanical methods using a goniophotometer provided with a stretchmeter.

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