I am from Bulgaria, and been celebrating it since kid. Even when I was a student (many years ago) abroad I wrote an essay about this traditional Bulgarian Spring celebration. Martenitzi is very popular in my country. Now, when I go to the city center, they sell them everywhere. Even, the retailers Kaufland, Lidl, Billa sell them.
I checked the info on the Internet and it is quite controversial with completely different theories about the roots of this celebration.
Ok, it seems that it is a common celebration in the region.
Yeah, the tradition is not the same, plus not everything Wikipedia says it's true as in Romania men don't wear it, neither get it. But it's still nice.