What does 'shop your closet' actually mean?
Styling new outfits from clothes you already own instead of buying new ones - treating your wardrobe as the store.
The practice has a real procedure: pull everything out, rebuild three to five outfits per category of your life (work, weekend, going out) using only what you own, and photograph each one. The photo log becomes your lookbook - on blank mornings you pick a photo instead of inventing an outfit. The side benefit is diagnostic: gaps become obvious ('three outfits need a neutral layer I do not own'), which turns future shopping into filling named slots instead of browsing. Most people who do a full closet shop find 20-30% more wearable outfits than they thought they had.