Italian Size to US Size Conversion Table
| Italian Size (IT) | US Size (US) | Reference Benchmark | Formula Step |
|---|---|---|---|
| 40 IT | 0 US | Petite Milanese silk crepe slip cocktail dress | US = 40 − 40 = 0 |
| 42 IT | 2 US | Structured Italian virgin wool peak-lapel blazer | US = 42 − 40 = 2 |
| 44 IT | 4 US | Florentine tailored cotton poplin shirt dress | US = 44 − 40 = 4 |
| 46 IT | 6 US | High-fashion Roman pleated silk midi skirt | US = 46 − 40 = 6 |
| 48 IT | 8 US | Tailored Italian lightweight wool cigarette trousers | US = 48 − 40 = 8 |
| 50 IT | 10 US | Double-faced cashmere long belted winter overcoat | US = 50 − 40 = 10 |
| 52 IT | 12 US | Milan runway structured corporate pant suit | US = 52 − 40 = 12 |
| 54 IT | 14 US | Floor-length silk chiffon formal gala gown | US = 54 − 40 = 14 |
| 56 IT | 16 US | Italian designer bohemian floral wrap dress | US = 56 − 40 = 16 |
| 58 IT | 18 US | Plus-fit Italian stretch denim designer jeans | US = 58 − 40 = 18 |
| 60 IT | 20 US | Luxury down-filled water-resistant city parka | US = 60 − 40 = 20 |
| 62 IT | 22 US | Elegantly draped satin evening caftan dress | US = 62 − 40 = 22 |
| 64 IT | 24 US | Quilted wool-lined luxury winter coat | US = 64 − 40 = 24 |
| 66 IT | 26 US | Bespoke Milanese evening tuxedo ensemble | US = 66 − 40 = 26 |
| 68 IT | 28 US | Hand-beaded Italian haute couture ballgown | US = 68 − 40 = 28 |
| 70 IT | 30 US | Atelier ceremonial embroidered silk robe | US = 70 − 40 = 30 |
Italian Size to US Size Formula & Unit Definitions
Because both the Italian and American sizing systems increment by standard 4 cm or 2-inch body circumference intervals, the mathematical translation is an exact linear subtraction: US = IT − 40.
Quick Estimation: Simply subtract 40 from your Italian garment size to determine your American dress size. For example, an IT 42 is a US 2, an IT 44 is a US 4, and an IT 46 is a US 6.
Italian Size (IT)
Source Standard- Standardized across Italian fashion houses and ready-to-wear ateliers.
- Numbered on an even scale starting from IT 38 and IT 40 through IT 54 and higher.
- Designed with dramatic body-contouring, higher armholes, and narrower shoulder widths.
US Size (US)
Target Standard- Standardized under ASTM D5585 specifications for female apparel sizing.
- Graded on an even scale offset 40 sizes below Italian sizing (IT 44 equates to US 4).
- Incorporates standard North American ease allowances across the bust, waist, and hips.
Frequently Asked Questions
Q.How do you convert Italian clothing size to US size?
Subtract 40 from your Italian size. For example, an IT 44 is a US 4, and an IT 46 is a US 6. To convert in the opposite direction, consult our US to IT clothing converter.
Q.What is the formula for converting Italian to US clothing sizes?
The official formula is US = IT − 40. It translates Italian fashion industry sizing into American imperial ready-to-wear sizing.
Q.What is an Italian size 42 in US clothing?
An Italian size 42 corresponds to an American size 2 (42 − 40 = 2). In luxury ready-to-wear, this represents an Extra Small or Small.
Q.Why do Italian sizes fit tighter than American sizes?
Italian designer patterns are constructed with narrower shoulder spans, higher armholes, and tighter waist suppression than American garments of equivalent numerical size.