noun which may take the genitive case particle 'no'
brand new; just bought
Describes something that has just been purchased and is still in new condition. Often used with nouns like 車, 靴, or 服.
買い立ての靴を履いて出かけた。
I went out wearing the shoes I just bought.
買い立ての車は新車の匂いがする。
A brand-new car smells like a new car.
新品 means 'brand new' in the sense of unused, while 買い立て emphasizes the recent act of buying, regardless of whether the item is technically unused.
Compound of 買い (buying) and 立て (just done), following the pattern of verb stem + 立て to indicate something has just been done.