"I still see her face now and then, smiling out of those 'P.Q's wife wears B.H. Wragge' ads'"
The advert referred to encapsulates one of the themes of The Bell Jar,
namely the fact that young women in 1950's America were expected to define themselves in relation to the men in their lives.
B.H. Wragge was an American clothing company, established in 1920. Between 1930 and 1950, it specialised in a style of 'separates' which was particularly popular with college students.
The significance of the initials 'P.Q' is not clear.