The Dupe Index · Analysis

Where to spend and where to save: what 38 red-carpet pieces say about dupes

The old advice says spend on coats, save on basics. Our data says the opposite about coats, agrees about basics, and adds a rule nobody talks about: spend on whatever the eye lands on first.

RunwayTwin Journal · 7 November 2026 · 7 min read

Every "spend vs save" list on the internet is somebody's opinion. We wanted numbers. So we took the 38 pieces from 13 celebrity looks that RunwayTwin's Drop Radar broke down this week, and for each one compared the original with a typical mid-range and high-street alternative, scored for how close each gets (Twin Score, 0–100).

Finding 1: the gap is biggest on the pieces that matter most

We tag every piece with a visual weight from 1 to 5: how much it defines the whole look. A gown or a statement coat is a 5; a thin belt is a 1. Then we compared the 19 hero pieces (weight 4–5) with the 10 supporting pieces (weight 1–2).

This is the counter-intuitive part. Cheap versions do worst exactly where they're most visible. A high-street belt or pair of earrings gets you most of the way; a high-street version of the hero dress does not. If you have one euro to spend, spend it on the piece the eye lands on first.

Finding 2: coats copy well, gowns don't

Outerwear has the smallest gap: a well-cut high-street coat gets 72% of the original. Coats are mostly silhouette and colour, and the high street is very good at both. Dresses and gowns have the biggest gap, because evening dresses live on fabric weight, drape and construction, the three things that cost money.

Finding 3: jewellery is where dupes give the most per euro

Original jewellery in these looks averaged 250 times the price of its high-street version, for a 25-point gap. Shoes were 16 times the price for 26 points. In resemblance per euro, costume jewellery is the best deal in fashion, and fine jewellery is the worst, unless the piece itself is the point (an Elsa Peretti cuff, a Cartier panther).

Finding 4: mid-range is rarely the answer

Across all 38 pieces, mid-range adds a median 7.5 points over the high street, usually for two to three times the price. The exceptions are outerwear and bags, where mid-range brands (Massimo Dutti coats, structured leather bags) close most of the gap. Elsewhere, the data says: buy the high-street version, or save up for the original. The middle is where money disappears.

The rules, from the numbers

1. Spend on the hero piece: whatever the eye lands on first. That's where cheap versions fail most.
2. Save on outerwear only if the cut is simple. A plain long coat copies at 72%+; a sculpted one doesn't.
3. Save on jewellery and belts unless the piece is iconic in its own right.
4. Skip mid-range for dresses, tops and skirts. Go high street, or go pre-loved original.
5. For evening dresses, fabric is everything. If the budget can't stretch to the right fabric, change the look rather than buy a thin copy.