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Use when evaluating the true value of a clothing purchase or comparing two items to make a cost-effective buying decision
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npx skills add https://github.com/jeffreytse/grimoire-core --skill calculate-cost-per-wearيبقى الأمر في سطر واحد. مرّر أفقيًا لمراجعته كاملًا قبل النسخ.
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Use when deciding how to allocate a manager's or leader's limited time across competing activities — before defaulting to whatever is most urgent, estimate each candidate activity's leverage (how many people's output it affects, for how long, and whether it requires your specific position), because a manager's actual output is the output of the organization under their influence, not their own individual task completion.
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| name | calculate-cost-per-wear |
| description | Use when evaluating the true value of a clothing purchase or comparing two items to make a cost-effective buying decision |
| source | Fashion Revolution "True Cost" analysis; Project 333 (Courtney Carver); Wrap UK "Valuing Our Clothes" report (2012) |
| tags | ["fashion","finance","wardrobe","cost-analysis","sustainability"] |
| verified | true |
Determine the real economic value of a garment by dividing total ownership cost by projected wear count, enabling rational comparison between cheap-but-disposable and expensive-but-durable options.
Adopted by: Personal finance advisors; sustainable fashion educators; Project 333 participants; Fashion Revolution transparency advocates Impact: Wrap UK (2012) found extending garment life by 9 months reduces carbon, water, and waste footprints by 20–30%; CPW analysis shifts consumer preference from fast fashion (avg CPW $3–8) to quality investment pieces (CPW $0.50–1.50); Fashion Revolution data shows price does not correlate with quality above a certain threshold Why best: CPW converts emotional purchase impulses into comparable financial units — the same mental framework used for any capital expenditure
Sources: Fashion Revolution "True Cost" analysis; Courtney Carver Project 333; Wrap UK "Valuing Our Clothes" (2012)
Define the formula — Cost Per Wear (CPW) = Total Ownership Cost ÷ Projected Wear Count. Target CPW: ≤$1.00 for everyday items, ≤$2.00 for occasion wear, ≤$5.00 for once-per-year formal items.
Calculate total ownership cost — include: purchase price + alterations/tailoring + dry cleaning (annual cost × expected years owned) + repairs. Exclude sunk costs on items already owned.
Estimate projected wear count — multiply: expected wears per week × 52 × years you'll own it. Use conservative estimates: fast fashion lifespan 1–2 years, quality basics 5–10 years, investment pieces 10–20 years.
Apply lifestyle reality check — before projecting wear count, verify: Does this fit your actual lifestyle? Does it fit your current body now (not aspirational)? Does it pair with 3+ pieces you already own?
Compute CPW and benchmark — divide total cost by projected wears. Compare against your CPW ceiling. Example: $200 coat, worn 3×/week for 8 months/year for 10 years = 240 wears/year × 10 = 2,400 wears; CPW = $0.08 — excellent.
Compare alternatives — run CPW on each option being considered. A $30 fast-fashion equivalent lasting 1 year at 1×/week = 52 wears; CPW = $0.58 — still acceptable, but factor in quality degradation after wash cycle 20.
Factor in resale value — for quality items, subtract estimated resale value from total ownership cost. Designer and quality basics retain 30–60% resale value on platforms like ThredUp, Poshmark, or Vestiaire.
Apply the regret test — if CPW is borderline acceptable, ask: "Will I regret not buying this in 30 days?" If uncertain, wait 48 hours; impulse passes, genuine need remains.
Document the decision — log purchase decisions (buy/pass) with CPW rationale. Review quarterly to calibrate projection accuracy — did you actually wear it as often as projected?
Recalculate on audit — at each wardrobe audit, retrospectively calculate actual CPW for items being retired. Compare projected vs. actual to improve future estimates.
