Quick Answer: Cost per wear divides a known price by an unknown number, so at the point of purchase it is entirely a prediction - and the prediction is made by the part of you that wants the item. It also ignores durability, ignores how a garment ages, and rewards buying more of what you already wear rather than what you lack. Better tests: does it replace something failing, does it work with five things you own, and would you buy it again at full price in six weeks.

Cost per wear is a good way to review a purchase and a poor way to make one.

By the time the number is accurate, the money has been gone for two years.

What is actually wrong with the arithmetic?

One of the two variables is invented. Price is known; wears are guessed, and guessed by someone already invested in the answer.

People systematically overestimate future wears, particularly for occasion pieces and for anything outside their existing habits.

It ignores durability entirely. A coat that survives 200 wears and one that pills at 40 produce the same forecast and completely different outcomes.

It ignores maintenance. Dry cleaning, resoling and repairs are real costs that never appear in the calculation.

And it rewards buying more of what you already wear, since those are the categories where the prediction feels safe - which is how wardrobes end up with six black jumpers and no coat.

Which makes it a justification engine, and a very effective one.

What should you use instead?

The replacement test. Does this replace something currently failing? Replacements are the highest-return purchases in any wardrobe and the least exciting.

The five-things test. Can you name five things you already own that it works with, specifically, without hesitating?

The six-week test. Would you still buy it at full price in six weeks? Almost nothing survives this and it costs nothing to apply.

The maintenance test. What does it cost to keep? A coat needing annual cleaning has a running cost; a machine-washable one does not.

The failure test. How does it age - does it get better with wear, or does it start declining immediately? Leather and good wool improve; bonded and coated fabrics do not.

Any three of those beats a cost-per-wear estimate, because none of them requires predicting the future.

Where does cost per wear genuinely work?

In review, after the fact. Looking back at last year’s purchases with real wear numbers is genuinely informative about your own habits.

For comparing two similar items, where the difference is quality rather than category - two coats, not a coat and a dress.

For categories where your history is long, since your own past wear rate for jeans is a real data point rather than a hope.

And for arguing yourself out of things, which it does well - if the number is bad even under optimistic assumptions, that is decisive.

It fails specifically on new categories, where you have no history and therefore no basis.

Which is exactly where people most often use it.

What Nobody Tells You About Investment Pieces

The best-value purchases in most wardrobes are boring and cheap. Well-fitting basics, replacement staples and alterations to things you already own outperform nearly every expensive purchase on any measure. Alterations in particular are the highest-return money there is, and nobody frames a fifteen-pound hem as an investment.

The pieces that get worn most are rarely the most expensive ones. They are the ones that fit best and need no decisions. An expensive coat that requires the right outfit underneath gets worn less than a cheaper one that goes over anything.

Maintenance cost is the hidden half of the price and almost nobody calculates it. A coat requiring annual specialist cleaning, a suede jacket needing protection, a silk dress needing hand washing - each carries a running cost that changes the real number substantially over five years.

Buying at the start of a season beats buying in the sales, for anything structural. Full size runs, complete stock, and a garment you will actually wear this year rather than next. Sales are excellent for known quantities and poor for first purchases in a category.

The most common expensive mistake is buying the exceptional-occasion piece. Wardrobes fail at the ordinary Tuesday far more often than at the wedding, and yet the wedding is where the money goes. The unglamorous truth is that a second good pair of trousers outperforms a beautiful dress on any accounting you care to run.

And nothing is an investment in the financial sense. Clothing depreciates from the moment it is bought, with very few exceptions. What a good piece buys is years of not having to think about that category again, and that is a real benefit which is simply not what the word investment means.

FAQ: Investment Buying Questions, Answered

Is cost per wear completely useless?

No - it is useful in review and for comparing two similar items. It is unreliable as a purchase justification, which is mostly how it gets used.

What is the best-value thing I can spend money on?

Alterations to clothes you already own, then replacements for things that are failing. Both are unglamorous and both outperform new purchases.

How long should I wait before buying something expensive?

Six weeks is a good default. Very little survives it, and what does is usually worth having.

Should I buy investment pieces in sales?

For known quantities, yes. For a first purchase in a category, no - you want full size runs and a full season of wear ahead of you.

What counts as a genuine investment category?

Outerwear, shoes, and bags - things worn constantly, seen constantly and expensive to replace badly. Occasion pieces almost never qualify.

How do I factor in maintenance?

Ask what cleaning it needs and how often, before buying. Multiply by five years. It changes some decisions completely.

TL;DR:

• Cost per wear divides a known price by a guessed number, and the guess is made by the part of you that wants it.
• It ignores durability, ignores maintenance, and rewards buying more of what you already own.
• Better tests: does it replace something failing, does it work with five things you own, would you buy it in six weeks.
• Maintenance is the hidden half of the price and almost nobody calculates it over five years.
• Alterations and replacements outperform nearly every expensive purchase on any measure.

The number is not wrong. It is just not available until long after you needed it.