Even the most vain men who spend absurd amounts of money on clothes and time in front of the mirror don’t do it. But most women do. Most little boys couldn’t care less, but most little girls care too much. Why? Doesn’t matter what country you’re from, where you went to high school or how tall you are. If you are a girl/lady/woman and possess an upper arm, letting it squish up against your rib cage is a current no-no. If you think I need to search for an American runway, benefit dinner or black-tie auction to find such poses, think again. Triangular arms are alive and well in…