Brand size guide

Marks & Spencer boys' suit sizes

Marks & Spencer's published boys' size chart in cm, dated and sourced, plus every Marks & Spencer suit we compare, with dated prices.

10 sizes in the chart 5 suits compared £55–£69 checked 10 Nov 2026

Marks & Spencer size chart

Marks & Spencer boys' suit size chart in cm
Size	Fits height up to	Chest	Waist
2–3 yrs	98 cm	54 cm	52 cm
3–4 yrs	104 cm	56 cm	54 cm
4–5 yrs	110 cm	58 cm	55 cm
5–6 yrs	116 cm	60 cm	56 cm
6–7 yrs	122 cm	63 cm	57 cm
7–8 yrs	128 cm	65 cm	59 cm
9–10 yrs	140 cm	70 cm	62 cm
11–12 yrs	152 cm	76 cm	67 cm
13–14 yrs	164 cm	82 cm	72 cm
15–16 yrs	176 cm	88 cm	77 cm

Checked 10 Nov 2026 Transcribed from M&S's online boys' size guide. Sizes rounded to whole cm.

M&S suits tend to run a little generous through the chest.

Marks & Spencer boys' suits, marketplace listings last
Suit	Fits height	Price	Checked	Where to buy
Navy Two-Piece Suit Marks & Spencer, jacket + trousers	110–122 cm	£55 est.	Checked 10 Nov 2026	Check price at Marks & Spencer (opens in a new tab)
Burgundy Suit Set Marks & Spencer, jacket + trousers Waistcoat sold separately.	104–122 cm	£58 est.	Checked 10 Nov 2026	Check price at Marks & Spencer (opens in a new tab)
Grey Check Three-Piece Suit Marks & Spencer, jacket + trousers + waistcoat	128–146 cm	£62 est.	Checked 10 Nov 2026	Check price at Marks & Spencer (opens in a new tab)
Green Tweed-Style Suit Marks & Spencer, jacket + trousers + waistcoat	98–116 cm	£65 est.	Checked 10 Nov 2026	Check price at Marks & Spencer (opens in a new tab)
Black Slim Prom Suit Marks & Spencer, jacket + trousers , slim fit	158–176 cm	£69 est.	Checked 10 Nov 2026	Check price at Marks & Spencer (opens in a new tab)

est. = guide price from the retailer's listing, not a live price. "Checked" shows when we last saw the price at the retailer.