Skip to main content

Size Guide

Use our guide to find the perfect fit for your child. If you’re ever unsure, our staff are always happy to help in store.
Our Story

Where it
all began

Sturdy Clothing Co. was founded in 1997, born out of a simple idea: that parents and pupils deserved a better uniform shopping experience. What started as a dedicated school shop on the premises of St Michael’s Preparatory School in Otford has grown into a trusted uniform supplier serving families across Kent and South East London.

From day one, we’ve operated completely independently – our own staff, our own suppliers, our own standards. That independence means we can focus entirely on what matters: providing the right uniform, at the right price, with the kind of personal service you’d expect from a family business.

The concept proved so popular that we’ve since introduced the same model to other schools in the area, with each shop tailored specifically to that school’s uniform requirements.

Before You Start
How to measure your child
For the best fit, take measurements over light clothing using a soft tape measure. Compare against our size charts below to find the right size.

Chest

Measure around the fullest part of the chest, keeping the tape level under the arms.

Waist

Measure around the natural waistline, keeping one finger between the tape and the body.

Inside Leg

Measure from the crotch to the floor along the inside of the leg.

Height

Stand straight against a wall, measure from the floor to the top of the head.
Buying tip: We recommend buying one size up to allow for growth, particularly for blazers and trousers. Our staff can advise on the best fit when you collect.
Size Charts

Find the right size

View sizing specific of school uniform ranges.
Upper Body
Blazers & Jackets

Chest Measurement

Age (approx)Chest (inches)Chest (cm)Size Label
7–8 yrs23″58cmSize 1
8–9 yrs24″61cmSize 2
9–10 yrs25″63cmSize 3
10–11 yrs27″68cmSize 5
11–12 yrs28″71cmSize 6
12–13 yrs29″73cmSize 7
13–14 yrs30″76cmSize 8
14–15 yrs32″81cmSize 10
15–16 yrs34″86cmSize 12
16+ yrs36–38″91–96cmSize 14–16
ℹ️ If between sizes, we recommend sizing up. Ask in store for advice.
Jumpers & Knitwear

Chest Measurement

Age (approx)Chest (inches)Chest (cm)
3–4 yrs22″56cm
4–5 yrs23″58cm
5–6 yrs24″61cm
7–8 yrs26″66cm
9–10 yrs28″71cm
11–12 yrs30″76cm
13–14 yrs32″81cm
15–16 yrs34″86cm
Shirts & Blouses

Collar Measurement

Age (approx)CollarChest
5–6 yrs11″26″
7–8 yrs12″28″
9–10 yrs12.5″30″
11–12 yrs13″32″
13–14 yrs14″34″
15–16 yrs15″36″
Lower Body
Trousers & Shorts

Waist Measurement

AgeWaistInside Leg
3–4 yrs20″14″
5–6 yrs21″17″
7–8 yrs22″20″
9–10 yrs23″22″
11–12 yrs24″25″
13–14 yrs26″28″
15–16 yrs28″30″
Girls’ Skirts & Pinafores

Waist & Height

AgeWaistHeight
3–4 yrs20″40″
4–5 yrs20.5″43″
5–6 yrs21″45″
7–8 yrs22″50″
9–10 yrs23″54″
11–12 yrs24″57″
13–14 yrs26″61″
Outerwear & Sports
Coats & Waterproof Jackets

Chest Measurement

Age (approx)Chest (inches)Chest (cm)
3–4 yrs22″56cm
4–5 yrs23″58cm
5–6 yrs24″61cm
7–8 yrs26″66cm
9–10 yrs28″71cm
11–12 yrs30″76cm
13–14 yrs32″81cm
15–16 yrs34″86cm
ℹ️ Size up for coats to allow for layers underneath.
PE Kit & Sportswear

Chest Measurement

Age (approx)Chest (inches)Chest (cm)
5–6 yrs24″61cm
7–8 yrs26″66cm
9–10 yrs28″71cm
11–12 yrs30″76cm
13–14 yrs32–34″81–86cm
15–16 yrs34–36″86–91cm
Adult S36–38″91–96cm
Adult M38–40″96–101cm
Girls’ Summer Uniform
Summer Dresses

Chest & Height Measurement

Age (approx)Chest (inches)Chest (cm)Height (inches)Height (cm)
3–4 yrs22″56cm40″102cm
4–5 yrs23″58cm43″109cm
5–6 yrs24″61cm45″114cm
7–8 yrs26″66cm50″127cm
9–10 yrs28″71cm54″137cm
11–12 yrs30″76cm57″145cm
13–14 yrs32″81cm61″155cm
Accessories
Socks

Shoe Size Guide

Sock SizeUK Shoe SizeAge (approx)
XS6–8.5 (child)3–5 yrs
S9–12 (child)5–7 yrs
M12.5–3 (junior)7–10 yrs
L3.5–6 (junior/adult)10–13 yrs
XL6.5–9 (adult)13+ yrs
ℹ️ Always size by shoe size rather than age for the best fit.
Helpful Advice

Tips for buying school uniform

Buy to grow

We recommend buying one size up, especially at the start of the school year. Blazers and trousers in particular have room to be taken in if needed.

Fit over size label

Age labels are a guide only. Always go by your child’s actual measurements rather than their age, especially for blazers and PE kit.

Ask us in store

Our staff know every item in the range and can advise on the best fit when you collect. Don’t hesitate to ask — getting it right first time saves hassle.

Not Sure About Sizing?

Our Size Guide Makes it easy.
Not Sure About Sizing?
Our Size Guide Makes it easy
Need more Assistance

Still not sure about sizing?
Our team are happy to help.

Not Sure About Sizing?

Our Size Guide Makes it easy.
Not Sure About Sizing?
Our Size Guide Makes it easy