If you wear sexy clothes, especially if they are associated with a fetish, you are signalling that you are interested in sex, or that being seen as a sexual being is important to you. So contradicting the claim to be asexual.
And before you ask, of course that doesn't mean that anyone has the right to grab you or do anything to you to which you do not consent. You are signalling, via your clothes or pose, that you are interested in sex - but only in principle. Not necessarily now or with any particular individual. You may feel that you want to be seen as desirable while not actually ever wanting sex. That's great. But it's disingenuous to say that other people should not perceive you as sexual, or that you are just dressing how you like, or to look good, because there are many different ways to dress which are flattering and not overtly sexual.
As pps have said, clothes convey messages. Think of the statements pop stars, celebrities or royalty try to make with their choice of outfit. "I am sexy/interested in sex" is one such message that bondage gear sends so don't complain if it is received and understood that way. (And just to reiterate, you are not required to follow through.)
Would you go to a funeral in bondage gear? Or to collect an MBE? No, you would not. You would find another fantastic outfit which was more suitable.