If you’re a writer who covers fashion, shouldn’t you know the names of the parts of a garment? Shouldn’t you know a sleeve from a waistband? A collar from a lapel?
The writer helpfully included a picture, showing the pin on the collar of the shirt:
You don’t need to be a fashion writer to know the difference between a lapel and a collar; it’s pretty much common knowledge among English-speaking people. Except if you write for Yahoo! Style where subject-matter knowledge is not a requirement: