I would strongly recommend you go to see a couples therapist or marriage counselling. Participating in cross-dressing behaviour without the other partner's knowledge will usually be interpreted as deceptive and dishonest and is always detrimental to the marriage relationship.
While you love cross-dressing, I am sure you love your wife and would not want to do anything that would hurt her.
Issues of boundaries and what is stirring up the desire to cross-dress can all be explorted in the counselling relationship and counselling will ultimately assist you both to develop a more open pattern of communication.
Keeping it hidden will only cause more angst and anger later.