The 1920s was the 1990s?
Less than a decade before the First Balkan War cut the area from the Turkish sphere of influence, Muslim women dressed moderately? Like the rest of Europe did at the time? Even Christian women wore veils back then, at least in Southern Europe.
Tito did quite a bit to eliminate Islamic practices and culture of any sort in Yugoslavia as he did with other religions en route to making it an atheistic communist entity. So that might have something to do with you not posting any photos of Muslim women in 1991 - BEFORE the Bosnian War.
In fact, post-war Bosnia has seen more in return to more traditional Islamic dress and culture, at least relative to how it has been after World War II. Not like they do in the Middle East, but a tad bit more.