ubranie- singular neuter
ubrania - plural not-masc personal

plural not masculine personal always has accusative=nominative.

if it were a singular feminine noun like "sukienka=dress" the sentence would be "Przyniosłem czystą sukienkę"

There's no such word.

"Przynosiłem" would mean "I used to bring", "I was bringing regularly".

"przynieść" (like here) - i.e. to carry something 'to here'.

"zanieść" - i.e. to carry something 'there'.

That sounds unusual to me, a bit... technical? But it's correct, added.

I love how 90% of comments starting with "I'm Polish, so I know better" are just wrong :)

Dostrzegasz różnicę między bought a brought?