Wardrobe Foundations means the building blocks of your wardrobe. These items are likely to be boring and/or invisible and some of your more expensive items.
Bra: Buy one that fits. Be fit, quite probably. Skin tone and smooth. If you haven’t replaced your bras in a year, this may be what’s meh-ing up your wardrobe. Bras stretch, and they have a short life-span. You will be hand-washing this bra and air-drying it in order to have it last for you as long as possible.
Shoes: Buy a pair of shoes that are fit-for-purpose (comfortable enough to do life without thinking about your feet) in your base dark color. This is likely to be your largest foundational investment.
Bottoms: Buy a pair of pants or a skirt in a basic color for you, in a fairly durable fabric.