What exactly does 'pusero' mean? Would you call this a 'pusero'? (See pictures)
2: http://img2.wbstatic.net/big/new/620000/625064-1.jpg
3: http://www.makroseuro.ru/data/shop/products/93d868156fa868e0d763c2f540a1e78f/i/logo0.jpg
4: http://www.adiont.ru/components/com_virtuemart/shop_image/product/_____________B20_4f841a68b6071.jpg
'pusero' means blouse. :)
As a tip I would say: Open google search in a browser and go to the picture search (Kuvahaku). Then type "pusero" and you'll get lot of pictures giving you a visual clue about word "pusero". Works many other words as well.
This is definitely a good question! I don't think even Finnish people agree completely. To some "pusero" just means about any kind of shirt, but I believe that many people also think "pusero" refers to a shirt with long sleeves. Even the dictionary definition of this word is rather vague, but I personally would definitely call the shirt in the first picture "pusero". However, I probably wouldn't use this term to describe the shirt in the 3rd picture, the term I'd use for that is "huppari"