Guess Size Guide

Guess uses US-based sizing – most styles are labelled with an alpha size XS–XXL or a US numeric size 0–12, jeans are sized by waist in inches, and the brand publishes a separate body-measurement chart for each garment category rather than a UK conversion.

Body measurements (cm)

Dresses & jumpsuits – alpha sizes

Size	Bust	Waist	Hips
XS	84–89	64–66	–
S	89–94	69–71	94–99
M	94–99	74–76	99–107
L	99–107	79–84	109–112
XL	109–112	86–89	112–117
XXL	114	91	119

Dresses & jumpsuits – numeric sizes

Size	Bust	Waist	Hips
0	85–86	64–65	90–91
2	88–89	66–67	93–94
4	90–93	69–71	95–98
6	94–97	72–75	99–102
8	98–100	76–79	103–105
10	102–104	80–83	107–109
12	105–108	84–86	110–113

Numeric sizes for tops & jackets and for bottoms use the same figures as the dresses & jumpsuits numeric chart.

Tops & jackets – alpha sizes

Size	Bust	Waist	Hips
XS	85–89	64–67	90–94
S	–	69–72	95–99
M	95–99	74–77	100–107
L	100–107	79–85	108–112
XL	108–113	86–90	113–118
XXL	114	91	119

Bottoms – alpha sizes

Size	Waist	Hips
XS	64–67	90–94
S	69–72	95–99
M	74–77	100–107
L	–	108–112
XL	86–90	113–118
XXL	91	119

Jeans & trousers

Waist size	Waist (cm)	Hips (cm)
23	58–60	85–86
24	61–62	88–89
25	64–65	90–91
26	66–67	93–94
27	69–70	95–97
28	71–72	98–99
29	74–75	100–102
30	76–79	103–105
31	80–83	107–109
32	84–85	110–112

How to measure

• Bust: measure around the fullest part of your bust.
• Waist: measure around the narrowest part of your natural waistline, located above your belly button and below your rib cage.
• Hip: stand with your feet together and measure around the fullest part of your hips.
• Inseam: measure from the top inside of your leg down to your ankle.

Source: Guess’s official size guide, checked 20 October 2026. Sizes can vary by style – if you’re between sizes, email info@willow.ie and we’ll measure the garment for you.