Deltas
For much of human history, only the very wealthy would have had clothing made just for sleeping in. In general, people were so tired from physical labour or hunger that they slept in their daily wear or, if they were lucky, an undershirt or smock", which was like a vest worn next to the skin and washed every six months whether it needed it or not. Nowadays the infant one piece romper suit or "onesie" is a way of combining a top and trousers in a loose garment which cannot be easily pulled off by a child, they are the symbol of babies and everything that is cute about them.
| Lenina |
Since everyone is obsessed with material goods in Brave New World, clothing is a good measure of character. On one level, clothing will tell you to what caste an individual belongs. Gammas wear green, Deltas wear khaki, Epsilons wear black, etc. But they also tell us about the society that the "civilized" people live in. For example in chapter 9, Lenina is wearing "a pair of pink one-piece zippyjamas." By that Huxley means onsies in a way implying her infantile behavior.
Question: Why would Huxley want to associate grown adults with a baby's infantile behavior?
Link to History of Pyjamas, Adult onesies, and Funzees