I've just finished a GC playing with Sardinia-Piedmont and never been able to convert a single POP into craftsmen, due to lack of 10 pieces of Regular Clothes.
In the middle of the campaign I though: wow, if I build up a Regular Clothes factory my POPs will become rich as the WM only has always 1 stockpiled. Then I built my factory and had 1 clerks POP in to the province, ready to be converted into craftsmen, in order to run my brand new factory (of course neither my people growth rate nor immigration were able to help me to get more POPs for my factory).
Guess what? For the rest GC just 1 regular clothes was stockpiled in the WM and I've never been able to get the 10 pieces I needed to convert my POPs.
Even worse the lacking of regular clothes lasted for the whole GC
Is this a known bug or what?

In the middle of the campaign I though: wow, if I build up a Regular Clothes factory my POPs will become rich as the WM only has always 1 stockpiled. Then I built my factory and had 1 clerks POP in to the province, ready to be converted into craftsmen, in order to run my brand new factory (of course neither my people growth rate nor immigration were able to help me to get more POPs for my factory).
Guess what? For the rest GC just 1 regular clothes was stockpiled in the WM and I've never been able to get the 10 pieces I needed to convert my POPs.
Even worse the lacking of regular clothes lasted for the whole GC
Is this a known bug or what?