I may no where be near what you are thinking..but just taking a stab at it. We had an AWESOME sweet sparkling white wine there a few years ago. It was called Moscato D'Asti made by Sarraco. It was in a dark green bottle. I went back the next year and they didn't have it anymore, but they could be selling it again. Could that have been it?
If not and you want to try that wine (which is also very sweet, there is one place I know of in the US you can get it at a good price (I buy like 5-10 at a time because it's so hard to get!). PM me if you want the website.