Why am I suddenly thinking of South Africa?
Practically the same arangement of shapes and similar colours
OMG! You're right, it really does resemble the South Africa flag.
Actually I worked on the basis on the horizontal bands found in the flags of Austria, Hungary and various Slav nations (Slovakia, Slovenia, Croatia) with inspiration for the triangle coming from the Czech flag. Thus keeping the idea within the Austria-Hungary borders.
Could I have been subconsciously influenced by all that World Cup football on the TV?