It's not like I have any special interest in bloomers. I don't have that kind of fetishism... I think.
Literal
Particularly bloomers [to-に] special interest [subject-が] exist [it's not that-わけじゃない]. Such fetishism [topic-は] not-exist, [quotative-と] think.
ブルマ is the shortened form of ブルマー 'bloomers.' フェティシズム 'fetishism' is a loanword. ~わけじゃない 'it's not that' denies an assumed interpretation. The trailing と思う 'I think' adds hilariously undermining doubt to the denial — 'I think I don't have that fetish.' Self-aware humor.