I've just started learning Czech and the knowledge of one seems to be helping rather than interfering with the other's :)
Could I say w styczniu kupuje nowy ubrania? for I buy new clothes in January?
Yes but with "nowe" instead of "nowy": W styczniu kupuję nowe ubrania
So, ubrania is neutral and it is not declinated? I mean, neuter is Acc=Nom?
"ubrania" is plural (singular "ubranie" is neuter and it also rather translates to "clothes", but it refers to one set of clothes), and as this is 'not masculine-personal plural', Nominative and Accusative are identical.
I have to think of the river from the underworld one had to cross when leaving the world of the living, according to the Romans.
Styczniu_ The river Styx; ( Styx was also a musicband in the '80s.)