I keep mis-reading your heading as Cross-Dressing essentials LOL!
I think you have got it, and of course there is a bit of a grey area in the middle for some pieces. I am wearing a navy/ink silky tee, the front and back are different fabrics. There is a keyhole in the back. Worn with a jacket it is a simple navy silky tee, worn alone it is a small statement... I also have a black pussy bow blouse with texture, Worn alone with a contrasting tank under (or just a black bra, which I have only done once on holiday in Sydney a few years back) it is a statement, worn with a black tank and a jacket and it is an essential.
I actually love these pieces that are "almost essentials" because they are versatile but have a bit of interest. I see your footwear falling into this category, in the summer/spring especially.