Girlfriend Collective Millie Straight Leg Sweatpant

Elevated comfort meets conscious design. The Millie Straight Leg Sweatpant from Girlfriend Collective reimagines the classic sweatpant with a refined, straight-leg silhouette that effortlessly transitions from studio to street.

Crafted from a soft recycled polyester blend, these sweatpants deliver a cosy feel while keeping sustainability at the forefront.

Designed with thoughtful details including an adjustable drawstring waist and practical side pockets. The relaxed fit through the hip and thigh flows into a straight leg that skims the body, making these versatile enough for morning yoga to casual weekend wear.

Straight-leg silhouette for a modern, flattering fit
Sustainable recycled polyester blend fabric
Adjustable drawstring waistband
Functional side pockets
Soft, comfortable feel with all-day wearability

Colour

Mink

Style

Large

Medium

Small

Size Guide

Name: Girlfriend Collective Millie Straight Leg Sweatpant
SKU: girlfriend-collective-millie-straight-leg-sweatpant
Availability: InStock

View one section at a time. Use Next/Prev or the dots to switch squares. If you’re between sizes, choose larger for comfort or smaller for compression.

Units

Measurements are body measurements, not garment dimensions.

1 / 9 • Women’s Tops

Women’s Fit

Tops (tees, tanks, jackets)

Size	Bust	Waist	Hip
XS	76–82	60–65	84–89
S	83–88	66–71	90–95
M	89–94	72–77	96–102
L	95–102	78–85	103–110
XL	103–111	86–94	111–118
XXL	112–120	95–104	119–127
3XL	121–129	105–115	128–136

Women’s Fit

Bottoms (leggings, joggers)

Size	Waist	Hip	Inseam
XS	60–65	84–89	66–69
S	66–71	90–95	68–71
M	72–77	96–102	70–73
L	78–85	103–110	72–75
XL	86–94	111–118	73–76
XXL	95–104	119–127	74–77
3XL	105–115	128–136	75–78

Sports Bras

Size	Underbust	Bust	Typical Cup
XS	68–73	76–82	A–B
S	74–79	83–88	B–C
M	80–85	89–96	C–D
L	86–93	97–105	D–DD
XL	94–102	106–114	DD–E
XXL	103–110	115–123	E–F

For high-impact, pick true size for compression or size up for comfort.

Men’s Fit

Tops

Size	Chest	Waist
XS	84–89	70–75
S	90–95	76–81
M	96–102	82–88
L	103–110	89–96
XL	111–118	97–105
XXL	119–127	106–115

Men’s Fit

Bottoms

Size	Waist	Hip	Inseam
XS	70–75	86–91	73–76
S	76–81	92–97	74–77
M	82–88	98–104	75–78
L	89–96	105–112	76–79
XL	97–105	113–120	77–80
XXL	106–115	121–128	78–81

How to Measure

Upper body

Bust/Chest: Measure around the fullest part, tape level and relaxed.

Underbust: Directly under the bust, snug but not tight.

Waist: Around your natural waistline (between ribs and hips).

How to Measure

Lower body

Hip: Around the fullest part of hips/glutes.

Inseam: Crotch to ankle bone along the inside of the leg.

Tip: Take measurements in lightweight clothing, standing tall, feet hip-width apart.

International Conversion

Prana Size	US	UK	EU	AU
XS	0–2	4–6	32–34	4–6
S	4–6	8–10	36–38	8–10
M	8–10	12–14	40–42	12–14
L	12–14	16–18	44–46	16–18
XL	16–18	20–22	48–50	20–22
XXL	20–22	24–26	52–54	24–26
3XL	24–26	28–30	56–58	28–30

Conversions are approximate. Consider fabric stretch and preferred fit.

Girlfriend Collective Millie Straight Leg Sweatpant

Size Guide

Women’s Fit

Tops (tees, tanks, jackets)

Women’s Fit

Bottoms (leggings, joggers)

Sports Bras

Men’s Fit

Tops

Men’s Fit

Bottoms

How to Measure

Upper body

How to Measure

Lower body

International Conversion

Find My Size

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