Aran Sweater Sizing Guide: How to Find Your Perfect Fit

For generations, Aran sweaters have been prized for their warmth, craftsmanship and timeless Irish style. Whether you're buying your first Aran sweater or adding another to your collection, choosing the right size is just as important as selecting the perfect pattern.

Unlike many modern knitwear styles, traditional Aran sweaters were originally designed to be practical working garments. They offered room for movement while trapping warmth, giving them a slightly different fit to today's fashion knitwear.

This guide explains everything you need to know about Aran sweater sizing, from how they should fit to measuring yourself accurately before ordering.

Do Aran Sweaters Run True to Size?

In most cases, modern Aran sweaters fit true to size, but the exact fit depends on the style and brand.

Some traditional Irish sweaters are designed with a more relaxed silhouette, while contemporary designs offer a slimmer fit that's easier to layer beneath jackets or coats.

At Kilkenny Design, we stock a carefully selected collection from leading Irish knitwear makers, with sizing guidance available on every product page to help you choose confidently.

If you're shopping our full collection, browse our complete range of Aran Sweaters or explore dedicated collections for Women's Aran Sweaters and Men's Aran Sweaters.

How Should an Aran Sweater Fit?

The ideal fit depends on how you plan to wear your sweater.

A classic relaxed fit

A traditional Aran sweater should:

• Sit comfortably across the shoulders
• Allow room for layering underneath
• Finish around the hips
• Have sleeves reaching the wrist without being overly long

This is the authentic Irish fit that has made Aran sweaters popular for decades.

A modern fitted look

If you prefer a more contemporary silhouette, choose your usual size in a slimmer-cut design or consider sizing down if the product description recommends a relaxed fit.

Many customers wear fitted Aran sweaters as everyday knitwear with jeans, tailored trousers or skirts.

Should You Size Up or Size Down?

There isn't one answer for everyone.

Size up if you:

• Plan to layer shirts or thermals underneath
• Prefer an oversized cosy look
• Are between sizes
• Want extra room for outdoor wear

Stay true to size if you:

• Want a classic everyday fit
• Intend to wear your sweater on its own
• Prefer a timeless silhouette

Size down if you:

• Prefer a close-fitting style
• Are buying a relaxed-fit design
• Want a fashion-focused rather than traditional look

Always check the measurements provided on individual product pages, as different brands may vary slightly.

How to Measure Yourself

Taking a few simple measurements can make finding the right size much easier.

Chest

Measure around the fullest part of your chest while keeping the tape comfortably snug.

Waist

Measure around your natural waistline.

Sleeve Length

Measure from your shoulder to your wrist with your arm slightly bent.

Body Length

If comparing with a favourite sweater you already own, measure from the highest shoulder point down to the hem.

Comparing these measurements with the size guide on the product page will usually give the most accurate fit.

Will an Aran Sweater Stretch?

Because Aran sweaters are made from natural wool fibres, they have a small amount of natural flexibility.

Rather than permanently stretching, quality wool tends to mould gently to your body over time while maintaining its shape.

This is one of the reasons authentic Irish knitwear can last for many years when properly cared for.

Do Aran Sweaters Shrink?

Natural wool can shrink if washed incorrectly.

To help your sweater retain its shape:

• Follow the care label carefully.
• Hand wash or use the recommended wool cycle if permitted.
• Avoid hot water.
• Dry flat rather than hanging.
• Never tumble dry unless specifically stated.

Proper care helps preserve both the fit and intricate cable stitching.

Choosing the Right Fit for Different Styles

Crew Neck Aran Sweaters

A versatile everyday option that works well with a classic or slightly fitted look.

Half Zip Aran Sweaters

Ideal for layering over shirts and lightweight tops, making a relaxed fit particularly comfortable.

Cardigans

Many customers choose a slightly roomier fit to allow for layering throughout the seasons.

Funnel Neck Sweaters

These provide extra warmth and often suit a regular fit that isn't too oversized.

Buying an Aran Sweater as a Gift

If you're buying for someone else:

• Check the size they normally wear in knitwear.
• If unsure, choose their regular size.
• For between sizes, sizing up is generally the safest option.

The timeless styling of Irish knitwear makes it a thoughtful gift that can be worn for many years.

Why Buy Your Aran Sweater from Kilkenny Design?

Kilkenny Design has long celebrated Irish craftsmanship, working with many of Ireland's best-loved knitwear makers to offer authentic Aran sweaters made from premium natural fibres. Our collection includes classic cable-knit designs alongside contemporary interpretations, making it easy to find a style that suits your wardrobe while staying true to Ireland's knitting heritage.

Whether you're shopping for everyday comfort or a special gift, you'll find expertly crafted knitwear designed to be enjoyed season after season.

Browse our Aran Sweaters, Women's Aran Sweaters, or Men's Aran Sweaters to find your perfect fit. These category pages are available across the US site and make ideal destinations for internal links from this guide.

FAQs

Should an Aran sweater be loose or fitted?

Traditionally, Aran sweaters have a relaxed fit to provide warmth and comfort. Modern styles are available in both relaxed and slimmer silhouettes.

Are Aran sweaters true to size?

Most modern Aran sweaters fit true to size, although some traditional styles offer a slightly roomier fit.

Should I size up in an Aran sweater?

If you prefer layering or an oversized look, sizing up can provide extra comfort. Otherwise, your usual size is typically the best choice.

Do Aran sweaters stretch over time?

Natural wool softens and gently adapts to your shape but should retain its original fit when cared for correctly.

Can Aran sweaters shrink?

Yes. Like most wool garments, they can shrink if washed in hot water or tumble dried. Always follow the care instructions provided.