First of all, if you are hiding your dressing and your "stuff" from your wife, it's only a matter of time before you slip up or she finds it. You should find a way to tell her about it.
As for the immediate problem, it's been suggested that you rent a storage unit and put your stuff there until you are settled in in your new place. That's a good idea. It might be possible to ship it to a storage business near your new location and have them put it into storage for you. You just have to make sure your wife doesn't see any receipts or communications from the storage company.
Hiding things from your wife is difficult, stressful, and not entirely honest. The longer you do it, the more difficult it will be when the time comes.
