Like Kimdl wrote, "I think its a matter of intent." But I think so for a completely different reason.

One of the definitions of fetish is "A sexual fixation on a concept, object, or body part. A person with a fetish feels a compulsive need to use the object in order to obtain sexual gratification, and cannot achieve pleasure without it."

It continues, "Common fetishes - for feet, watching pornographic movies, for lacy underwear, certain smells etc."

So when is wearing only high heels or only panties or whatever crossdressing, and when is it a fetish?

Perhaps if you just put it on to get sexually aroused, then it isn't crossdressing?