ubranie or ubrania?
as far as I can see, 'ubranie' = 1 piece of clothes, 1 item, 'ubrania' = clothes
do I get it right or is there something I'm missing?
"ubranie" is rather "one set of clothes". Not one item. So for example "moje ubranie" can refer to the clothes I am wearing right now.
Meanwhile, "ubrania" is a... well, a more general plural, for example the clothes in your wardrobe.
I don't think "Mam ubranie" should be accepted.
I know it's a very old comment, but let me just say: yes, it is. At least now, maybe it wasn't back then.