Size Guide

The Hello Moon guide to choosing the right size

Choosing the right size is about more than just a letter on a label. From one brand to another, and from one cut to another, the same size can fit very differently.

That’s why the aim of this guide isn’t to confine you to a strict size chart, but to give you simple guidelines for choosing the size best suited to your body shape, the garment’s cut, and the look you want.

Why size matters… but isn’t everything?

A size is above all a guide. It helps inform your choice, but on its own, it is not enough to determine how a garment will fit.

Two pieces in “M” can have a completely different drape depending on:

their cut (fitted, straight, oversized)
their fabric (flowy, stretchy, structured)
their elasticity
their construction

A flowy dress is not chosen in the same way as structured jeans, and an oversized sweater is not worn like a fitted blazer. That is why it is essential to consider all of these factors before choosing your size.

Size, fit, and body shape: three different concepts

To choose a garment correctly, it is important to distinguish between three concepts:

Size: refers to measurements (XS, S, M, L…)
Fit: defines how the garment falls on the body
Body shape: refers to how the volume of your silhouette is distributed

👉 If you would like to explore this topic further, you can consult our dedicated body shape guide.

How to take your measurements?

To choose the right size, it is essential to know your key measurements. Take a flexible tape measure and measure:

Bust measurement: Around the fullest part of your bust, without pulling the tape tight.

Waist measurement: Around the narrowest part of your torso, usually above your navel.

Hip measurement : Around the widest part of your hips.

✔️ A few tips:

stand naturally
do not pull the tape measure tight
take your measurements over thin clothing or directly against your skin
ask for help if necessary for greater accuracy

The dimensions of our clothing

At Hello Moon, we know that a simple S, M, or L isn’t always enough to make the right choice. That’s why we provide the garment’s key measurements directly on every product page.
This allows you to easily compare them with a piece you already own and enjoy wearing.

We also indicate the size worn by the model on all our product pages. This information helps you better visualize how the garment looks when worn.

Hello Moon Size Guide

👉 These guidelines are provided for general reference. They may vary slightly depending on the cut and materials of each product.

How to use our product pages?

To help you make the right choice, each Hello Moon product page has been designed as a genuine decision-making tool.

There, you’ll find several essential pieces of information:

the detailed garment measurements
the fabric composition
the product’s fit (straight, loose, fitted, oversized…)
the size worn by the model
sometimes, sizing advice when a style fits differently

👉 If you’re hesitating between two sizes, we recommend that you:

compare the garment measurements with a similar item in your wardrobe
take your preferred fit into account (fitted or looser)
consider the fabric (with or without stretch)

Taken together, these details are much more reliable than a simple size indication.

Choose the right size for each category

Tops: tops, T-shirts, shirts, blouses, sweaters, cardigans, bodysuits

Check:

bust
shoulders
desired ease

Keep in mind:

flowy fabrics drape more naturally
stretch provides greater comfort
oversized cuts are designed to be worn loose

Bottoms: jeans, trousers, shorts, skirts

Check:

waist
hips
length

Keep in mind:

stiff fabrics have a more structured fit
stretch fabrics are more forgiving
if in doubt → use the hips as your reference point

One-piece styles: dresses, sets, jumpsuits

What to check:

bust
waist
hips
overall length

Key points:

the bust is often the deciding factor
the cut has a major impact on the fit
fluid fabrics offer more flexibility

Jackets & coats

Check :

shoulders
room at the bust
layering

Keep in mind:

a jacket should be able to close without pulling
a coat is often slightly looser

Shoes

Check:

foot length
width depending on the style

Keep in mind:

some materials stretch slightly (leather, suede)
if you're unsure → prioritize comfort

What about during pregnancy?

During pregnancy, your body changes gradually, and your usual size may no longer be the best guide.

Rather than relying solely on the label (XS, S, M, L…), we recommend checking the measurements provided on each product page. They will make it easy to compare the garment’s measurements with a piece you already wear and better anticipate how it will fit.

Flowing cuts, stretchy fabrics and elasticated waistbands often offer greater comfort and freedom of movement, depending on your preferences and stage of pregnancy.

Find all our advice in our guide to clothing suitable for pregnancy.

The most common mistakes

Choosing your size online can sometimes seem complicated, but certain mistakes are common:

• relying solely on your usual size

• overlooking the garment’s cut

• failing to take the fabric into account

• not checking the measurements provided

• comparing two brands with each other

• overlooking the information provided on the product page

These factors are nevertheless essential for making a more reliable choice.

Useful links to help you choose your clothes more easily

To complete this guide, discover our other essential content:

Tops & T-shirts • Shirts & Blouses • Jeans • Trousers • Shorts • Skirts • Dresses • Co-ords & Jumpsuits • Blazer • Sweaters & Cardigans • Jackets & Coats • Shoes • Accessories