You buy new clothes but keep wearing old formulas

11:40 p.m., you're in bed with your phone. There are already three things in your cart: a latte-colored jacket, chunky lug-sole boots and a shirt that makes the model look like she's living a completely different life. It's not that you can't live without them. You're just tired of seeing the same you in the mirror, and it feels like these three things will finally get something moving.

The package arrives Thursday. On Friday you wear the jacket and feel a little different. On Tuesday you wear it with the same jeans, the same sweater and the same sneakers as always. A month later the jacket hangs with everything else and looks like it's always been there.

I've tested this many times, on myself and on clients: a new piece in an old system quickly becomes just another old piece.

You're not tired of your clothes

If you honestly break down how you dress, you'll find you have three or four formulas. Jeans, a sweater and sneakers for every day. Black pants, a shirt and flats for "serious" days. A dress with a cardigan for special occasions. Every morning you plug whatever's in your closet into these formulas, like new numbers into an old equation. That's why the answer always comes out the same.

Formulas don't come from a lack of taste. Once upon a time they saved you: they were comfortable, people complimented you, and you didn't have to think at seven in the morning. Your brain loves decisions that have already worked and repeats them for years. But your life has changed since then, and the equation hasn't. The new jacket is just one more number in it.

So here's my suggestion: for one week, break the formulas and leave the clothes as they are.

Day 1. Bring out what you've been saving

The silk blouse, the bright bag, the earrings that feel too precious to wear. Hang them all somewhere you can see them, on the closet door or the back of a chair. This week these pieces work every day, and you wear the first one today, even if you're just running out for bread.

And one rule for the whole week: take a mirror selfie every morning in the same spot. Nobody will see these photos but you, so no need to suck in your stomach.

Days 2 to 5. One new rule a day

The most interesting stuff on these days happens before lunch. If you want to change by noon, that's an answer too, and it's worth writing down. Your body usually gives up before your head can explain why the outfit is "fine."

1. Day 2: one bright piece in every outfit. Notice where color helps you most: near your face, on your feet or in your hands.
2. Day 3: one color head to toe. Even beige or gray looks put-together in monochrome, and you'll quickly see which shades are yours.
3. Day 4: something used the wrong way. A dress over pants, a men's sweater as a dress, a scarf as a belt. This is where you'll find combinations you won't see in any store.
4. Day 5: your comfiest shoes and one bold detail. A test of how much boldness you have left when your feet don't hurt.

Days 6 and 7. Keep what worked

Open all the week's photos side by side on your phone and look through them twice. First, remember which outfits got compliments. Then find the ones where you liked yourself, without anyone saying a word.

Often these are two different lists. Compliments tend to go to outfits where you look appropriate. The ones you like yourself are usually quieter and a little stranger, and that's where most of you is.

Write down two or three combinations from the second list. These are your new formulas, built from clothes that have been hanging in your closet this whole time.

When it really is time to buy something

After a week like this, the gap usually shows up very clearly. There's no blazer that works with all your new formulas. There are no shoes you can actually walk all day in on Prague's cobblestones. That's the kind of specific job worth shopping for.

Before you pay, do one check: name three outfits from what you already own that this piece will join tomorrow. If you can name all three, buy it with a clear conscience. If you get stuck on the second one, you're probably buying the promise of a new you again.

And that late-night cart? No need to clear it. Just open it in a week and see how many of those things you still need.