Etiquette: The Blue Book of Social Usage by Emily Post, New York and London, Funk & Wagnalls Co, 1922/37.

Clothes of children need no comment because children should be allowed to dress like their friends. Nothing makes even a young child, especially a boy, more self-conscious than to look “strange” to the children he plays with.
Long curls that used to so mortify the small boys of long ago are happily past, but the mother who loves to beribbon and lace-trim her daughter like a doll and dress her son in picture clothes when all the friends wear gingham jumpers or jerseys and “reefers” is not making her darlings look beautiful, but ridiculous.

Another cause for the general dejection of the far-too-typical American man’s clothes is the all-too-typical wife who lets her husband look like a tramp. We can all name women who are themselves walking advertisements of the “beauty specialist,” the hair dresser, the manicurist, and whose clothes bear every evidence of unceasing attention as well as frequent bandboxes from the dressmaker’s or the milliner’s, but whose husbands’ clothes loudly bewail the fact that cleaning fluid, pressing iron and mending basket have never been within aid-giving distance.