A shallow depth of field means that what part of the photo will be in focus? A. Only a small portion that you choose
B. Only items in the foreground
C. Most of the image will a few parts not in focus
D. All of the image will be in focus

including the octave, the answer would 8 notes in a major scale with one note being played twice. ex) c major scale includes: c, d, e, f, g, a, b, c

notice that c is played twice

however, if you were to ask me how many different notes are in a major scale- the answer would be 7.  

i think it is more of an artistic statement, because clothing featured in these photographs and magazines is so extravagant that most people would not be even tempted to wear it, let along purchase it