Noun: Newness, novelty.
Huippu is a noun often added to other nouns to indicate they they are the ”top” one, so our example sign from the clothing department reads ”The top novelty from Italy!” or maybe ”The top new thing from Italy!”
Uutuus comes from the adjective uusi, meaning ”new,” ”fresh” or ”novel” plus the suffix -uus.
The suffix –uus/-us or -yys/-ys can be used with most adjectives to create nouns meaning something that has that quality.
Forming these nouns can be tricky because their formation is affected by consonant gradation and whether or not the adjective stem ends in a vowel. Read the rules here.
Other examples of this type of noun are kaunis (“beautiful”) → kauneus (“beauty”), punainen (“red”) → punaisuus (”redness”), or pieni (”small”) → pienuus (”smallness”).