There are different opinions on whether or not perfumes containing chametz alcohol are permitted during Pesach. If you're not sure, you should check with your Rabbi.
Please see the related link for an explanation of the different opinions.
All perfumes made from ambergris are NOT kosher any time of the year, because whales are not a kosher animal.
it is quite a popular and expensive perfume brand
It would have to be certified kosher for Passover.
The perfume Very Irresistible by Givenchy is widely available. This perfume can be purchased at Macy's, Walmart, Sephora, Nordstrom and Boots. This product is also available online from Amazon and eBay.
The label has to say "Kosher for Passover"
ebay Online Stores
Yes, only if they are specifically certified kosher for passover. You can find kosher for Passover olives at any Jewish supermarket
Although the name suggests it would be expensive, Givenchy Amarige perfume is not overly pricey. Depending on the size, one can buy a bottle from $43-$72.
It can be, it would require a valid Passover hechsher.
Yes, it can be since it is made from wine, which can be Kosher for passover if created under appropriate supervision. The bottle would require a kosher for Passover hechsher.
If you were able to find corn vinegar that is certified kosher for Passover, it would be kitniyot which means that the majority of Ashkenazi Jews would not use it.
There are kosher food companies that are now making gluten-free products Kosher for Passover and all-year-round. However, something being gluten-free has no bearing on whether or not it is Kosher or Kosher for Passover.