Wait a minute two sentences agi I got dinged for saying topi saya baru, now I'm wrong for saying topi baru saya
topi baru saya = my new hat (a phrase)
Topi saya baru. = My hat is new. (a sentence)
What if you're using "topiku"? Actually, I tried submitting "Topiku baru" which was not accepted since that's a sentence, not a noun phrase. I guess, you cannot use the -ku suffix in this case.
What is wrong with "Topiku baru."???