Well, I have a balloon fetish (not to be confused with inflation fetish, they are two different fetishes).
A common term for people with this fetish is looner. I’m mostly sure this term have been used before the 2000s, it comes a long way.
A few years back, there was very little artwork related to this fetish here on Derpi. Over the years, it started to get a little more known and more imagery started to show up, not just in the MLP fandom but as well others like in the Anime fandom, as well the fetish itself. It also makes it difficult to find in other boorus due to the lack of the specific tag.
Also, clothing-wise, I really like plaid skirts. Bonus points if both balloons and plaid skirts gets mixed.