Description is too much, when the author wants to explain the scene as if it were a movie instead of a piece of writing. In a movie, the objects in the background are all part of the scene. The story is told by the camera, and the audience sees whatever is on the screen, including the main character's face. In a book, the main character may be telling the story. If you were telling a story to a friend, then can you really see yourself? You can see parts of yourself - your arms, your legs, the front part of your body, maybe a little bit of your nose, maybe your glasses (if you wear one), but you cannot see your whole self. If you were to stand in front of the mirror, then you can just see your reflection, not your true body. So, in a book, anything related to the main character's appearance would probably be a given. Your main character may wake up one day and dress for school or work. Your main character may just care about the work uniform placed on the chair the previous day. They don't care about the color or the style, because the main character wears exactly the same clothes to work everyday, and any such detail would be irrelevant. The main character may explain to the reader that (s)he has to wear dark blue top and black pants to work, and (s)he has the correct type in the closet, and that's all that matters to the narrator. If the narrator feels cold, then the narrator may complain that (s)he has to wear a thin, cotton, short-sleeved shirt as a work uniform. There you go. Now, you picture that the top is thin, made of cotton, and short-sleeved.
So, the answer to your question varies. If you are the type of person who just wants to wear appropriate clothing to work, then you may just be interested in how work-appropriate the clothing is. If you are the type of person who wants to look good at work, then you would probably choose something that is both work-appropriate and good-looking. If that good-looking characteristic includes the type of fabric or the quality of fabric, then you should mention that.
Now, if you are telling the story in third person, looking at all the characters as an outsider, then you need to know what the story is about. If the story is about your main character becoming acquainted with the new social class, then do you really need to elaborate on the fine details of food on the table, down to the molecules and atoms? Well, if the molecules and atoms of the food are relevant to the plot, then you would probably have to talk about them. But if they are irrelevant, then why are you including this? Anything that is not relevant to the story can be edited out in the final draft, unless you know your reader will enjoy this bit of information in spite of the story.