A medium is not always a medium. Order the same letter size from a North American label, a UK retailer and an EU or Asian brand, and you can end up with three genuinely different garments. For a t-shirt, that inconsistency is an inconvenience. For a leather jacket or vest, a piece with almost no stretch and a cut that is meant to sit precisely on the shoulders, it is the difference between a garment that fits for years and one that never feels right.

This guide exists to remove that guesswork. Whether you are shopping VOOLUP from outside North America, sizing a gift for someone overseas, or simply trying to translate a measurement you already know into our S to 2XL range, the charts below give you a clear, direct conversion for leather jackets, leather vests and graphic tees.

1. Why Sizing Isn't Universal

Clothing sizes are not governed by a single global standard. Every region built its own system, often decades apart, around its own average body measurements and its own manufacturing conventions. The result is a patchwork of numbers and letters that all look similar on a size chart but rarely line up in practice.

Three things drive most of the confusion:

• Regional grading differences. A size Medium cut for the EU market is typically built on a narrower base measurement than a size Medium cut for the North American market. Asian sizing runs narrower again, both in the chest and the shoulders.
• Numeric versus alpha systems. The UK and EU frequently use numeric sizing, especially for tailored outerwear, while North America defaults to S through 2XL. Converting between a number and a letter is where most ordering mistakes happen.
• Fit intent. A slim biker silhouette and an oversized streetwear tee are designed around different amounts of ease. The same body can reasonably wear a Medium in one and a Large in the other, which is why jackets, vests and graphic tees need separate charts rather than one blanket conversion.

This matters more with leather than with almost any other material. Woven fabric and knit cotton both have a small amount of give that forgives a size that runs slightly small. Genuine leather does not stretch in any meaningful way across the chest or shoulders. Getting the size right before you order is the only way to get the fit right once the piece arrives.

2. Leather Jacket and Vest Size Conversion Chart

VOOLUP leather jackets and vests are cut on a consistent S to 2XL scale across both our men's and women's lines. Use the chart below to translate that scale into the UK, EU and Asian equivalents you may already know from other brands.

The EU and Asian columns above are the closest general equivalent for outerwear grading in each region and are meant as a starting point, not a substitute for your own measurements. Because grading can still vary slightly between manufacturers, we always recommend confirming your fit against actual chest or bust measurements rather than relying on a size label alone. Our complete size guide walks through exactly how to measure yourself for a precise result.

3. Graphic Tee Size Conversion Chart

VOOLUP graphic tees are cut with an intentional drop shoulder and an oversized, relaxed silhouette, which is a different fit philosophy than our tailored leather pieces. The conversion below reflects that streetwear fit, so treat it separately from the outerwear chart above.

Because the fit is meant to be relaxed rather than fitted, most people find their usual tee size works well in our cut. If you prefer a closer, less oversized silhouette, sizing down one level from your everyday tee size is the more reliable move. Our graphic tee fit guide and oversized versus regular fit guide go further into how to choose between the two.

4. How to Use This Chart With Your Own Measurements

A conversion chart gets you close. Your own chest, bust or waist measurement gets you exact. The most reliable way to order across any of these systems is to measure yourself first and use that number to find your VOOLUP size, then treat the international columns as confirmation rather than the starting point.

Start With a Real Measurement

Measure around the fullest part of your chest or bust with a soft tape, keeping it level and snug but not tight. For jackets and vests worn over a shirt or light layer, measure with that layer on so the result reflects how you will actually wear the piece. Compare that number against our size guide rather than against a size you remember wearing from another brand, since grading differs even within the same country.

Account for the Layer You Plan to Wear Underneath

A leather jacket worn over a t-shirt and one worn over a sweater need slightly different amounts of room. If you plan to layer heavily in colder months, it is worth sizing toward the upper end of your measurement range rather than the lower end. This matters more with leather, which will not stretch to accommodate a bulkier layer the way a knit fabric would.

When You Fall Between Two Sizes

For structured biker and moto silhouettes, size up rather than down. A jacket or vest that is slightly roomier can still be worn well and layered comfortably, while one that is too tight across the chest or shoulders will always feel restrictive and can strain the seams over time. For a full breakdown of fit by silhouette and body type, see our leather jacket fit guide and leather vest fit guide.

5. Common Sizing Mistakes When Shopping Across Borders

Most international sizing mistakes are avoidable once you know what to look for. A few patterns come up again and again.

• Ordering by memory instead of measurement. A size that fit perfectly from a different brand is not a reliable guide to another brand's grading, even within the same country. Always check against a current measurement.
• Confusing EU numeric sizing with a chest measurement. An EU 50 is a size label, not a chest measurement in centimetres. Use the chart to translate it back to an alpha size and confirm with your own measurement.
• Assuming tees and outerwear convert the same way. Because our graphic tees are cut oversized and our jackets and vests are cut close to the body, the same VOOLUP size can sit differently across the two categories. Always check the chart that matches the product you are ordering.
• Sizing a gift without a reference. When ordering for someone else, ask for a real chest or bust measurement rather than the size they think they wear. It is the single most reliable number in this entire guide.

Getting the size right the first time matters most with genuine leather, where the investment is meant to last for years rather than a season. If you are still deciding which silhouette or category is right for you before sizing it, our leather jacket buying guide and leather vest buying guide are the right place to start.

Whichever region you are ordering from, the goal is the same: a piece that fits precisely enough to wear with confidence from the first day, whether you are browsing men's leather jackets, women's leather jackets, men's leather vests, women's leather vests or graphic tees.