Baatis were a thing before the 70s it was just worn differentJust because a cultural item is ‘new’ doesn’t mean it’s not ours.
For example baati’s (and particularly how we wear them with gorgoraad and shawl) are an invention of the 70’s.
Somali women traders in SEA would buy fabrics and sell the extras as pyjamas. The people started styling them in our own unque Somali fashion. The sales of baati’s with matching sets grew etc.
There is a reason why we call ourselves maryoleey and why all our clothing etc has a similar style etc. just like how Nigerians have their fitted dresses, Somalis like long materials with an underdress that is made with bright materials.