"high social class" is correct and can be used in written English.
It can be used when discussing the definition of social class or to describe people who are members of a higher social class. Example: Her family is of a high social class which has earned them respect and admiration in the community.
Gordon was the illegitimate child of Jack Copper, Sackville-West's chauffeur (a grandfather was Rudyard Kipling's gardener) and Marjorie Hall Ticehurst, who came, Mrs. Simmons always said, from a high social class.
This term, according to White, is supposed to mean someone of a high social class who has a friendly and gracious manner toward inferiors.
A review in 1989 found that in developed countries women of a high social class were less likely to be obese.
The Cambridge Dictionary defines it as a "young man from a high social class who speaks loudly and behaves in a noticeable way in public".
Whether affluenza is real or imagined, money really does change everything, as the song goes -- and those of high social class do tend to see themselves much differently than others.
For example, it has been suggested that "more parents of high social class families [have] the necessary information and financial resources to find their way to the specialized facilities" [23] and "a knowledgeable and determined parent of an autistic child [is] more likely to obtain an informed diagnosis" [24].
In the developing world, women, men, and children from high social classes had greater rates of obesity.
In Finland, consumption of fruits and vegetables is highest among high social classes.
Moreover, the use of CAM has been found to be less common in low social classes than in high social classes [ 17].
For colon cancer we found higher incidences in high social classes, and a slight decrease in social class differences over time.
It was obvious to Hill that Susan was from a higher social class, which made him a little self-conscious.
