I bought him at the local pet store being sold as a female... in with the females.
They only ever have about three males at any one time each put in a tank with a community fish and all always with long flowy tails(is that veil tail?)so they would never know or probably seen a male like this unless they have done research in to bettas.
All the girls are dark colours and boys pretty much blue or red...not like some of the amazing colours i have seen on this forum,so i guess im lucky to have him and they would just put him back with the females anyway if i took him back...i did question the lady last time i picked up a few girls about a suspicious female(i now know male) that looked like this guy but with bigger fins...she said she would put it in with a male to find out.
So i guess they often have male plakats but just dont know it.