I came across the expression on a JapanToday webpage.
Why it's hard to make vaccines and boost supplies
"We think, well, OK, it’s like men’s shirts, right, I’ll just have another place to make it,” said Dr Paul Offit of Children’s Hospital of Philadelphia, a vaccine adviser to the U.S. government. “It’s just not that easy.”
I simply take it as something like "we have a lot of choices; if any particular one thing doesn't meet our demand, then let's just try another one", and I believe I would probably be in the right direction, but my question is if it is a colloquial expression you often use or not. I wonder why "men's shirts". Could it be anything like one's shoes, ties, coat etc.?