I can really see both sides of this. My understanding of gender is different than your wife's (I believe there exists non-binary gender), but I can understand a wife who believes there are men, women, and nothing in between. To such a wife any cross-gender expression is incomprehensible and further, it is distasteful. Or, if you are in the binary (if you are TS and will never truly be happy unless you eradicate your male self), then I can see the push-pull between the two of you and I can certainly understand your wife's denial as she attempts to preserve the status quo with a husband that she loves.

She has seen Sara emerge bit by bit, first with a few items of clothing, then outings combined with body shaving, eyebrow plucking, nail growing and polishing, long hair, (and also from your past posts increasing hip and butt size), plus an ever increasing accumulation of clothing and accessories. She might have reluctantly been OK with all of this as long as your things were "impermanently" scattered around the house in tote bags, as if this was a phase that might eventually subside. But, a clothes closet that is dedicated to Sara lends an air of permanence and it is as serious to your wife, I'm guessing, as if you were deciding to begin taking hormones.

Still. She should allow for adequate storage of clothing. It really is just clothing storage in a house that you both share, and it will not change anything. But, you need to be crystal clear with her right now about your ultimate goals. This business of bit-by-bit growth, and your wife also noticing your ever increasing need (and sheer joy) in expressing Sara, is torture to her, as I'm sure it is for you as long as there is an elephant in the room. Hiding an elephant is stressful both for the person hiding it, and the person who tries hard not to see it.

In other words, it is not about the new closet for your stuff, it is about where this is all heading.

If you can honestly say that you also have a male identity that YOU do not wish to eradicate (as opposed to saying you are attempting to maintain a balance out of your love for her), then TELL HER this in order to ease her fears. She's not interested in hearing that you are holding yourself back for her. She wants to know that you are not moving forward for YOU. If you cannot do this, then it might be best for the two of you to part company sooner than later. It's damn hard starting a life over, the closer one gets to retirement.