Size guide
Ready to make a statement? Our swimwear is crafted to give you the perfect fit and a sexy, stylish look that turns heads all season long. From flattering swimsuits to bold bikinis, we’ve designed each piece with your shape in mind. For the best fit, always check our size guide and choose styles that enhance your natural curves—whether it’s high-waisted swim bottoms to elongate your legs or a strappy bikini top for added allure. Mix and match styles to create a look that’s uniquely yours. When you feel confident in your swimwear, you own the beach. Shop now for swimwear that combines comfort, style, and a flawless fit!
Rileys Guide to Finding Your Perfect Swimwear Fit Know Your Measurements
Bust: Measure around the fullest part of your chest, ensuring the tape is straight across your back.
Waist: Measure around your natural waistline, typically located just above your belly button.
Hips: Measure around the fullest part of your hips, keeping the tape comfortably snug but not tight.
XS
US: 0–2
AU/UK: 4–6
Cup: A–B
Bust: 32–33.5 in (81–85 cm)
Underbust: 26–28 in (66–70 cm)
Waist: 25–26 in (63–67 cm)
Hip: 35–36.5 in (89–93 cm)
S
US: 2–4
AU/UK: 6–8
Cup: B–C
Bust: 33.5–35 in (85–89 cm)
Underbust: 28–29 in (70–74 cm)
Waist: 26–28 in (67–71 cm)
Hip: 36.5–38 in (93–97 cm)
M
US: 4–6
AU/UK: 8–12
Cup: B–C
Bust: 35–37 in (89–93 cm)
Underbust: 29–31 in (74–78 cm)
Waist: 28–29.5 in (71–75 cm)
Hip: 38–40 in (97–101 cm)
L
US: 6–8
AU/UK: 12–14
Cup: C–D
Bust: 37–38.5 in (93–97 cm)
Underbust: 31–32 in (78–82 cm)
Waist: 29.5–31 in (75–79 cm)
Hip: 40–41.5 in (101–105 cm)
XL
US: 8–10
AU/UK: 14–16
Cup: D+
Bust: 38.5–40 in (97–101 cm)
Underbust: 32–34 in (82–86 cm)
Waist: 31–33 in (79–83 cm)
Hip: 41.5–43 in (105–109 cm)
Consult the Size Guide
Always check the size guide for the swimwear you’re considering. Match your measurements to the brand’s sizing chart to find your ideal size.
If you're in between sizes, consider the fit you're looking for—whether you prefer a more snug or relaxed feel.
Consider the Style and Cut
Bikinis: Look for adjustable straps and clasps to customise the fit. High-waisted bottoms can help elongate legs, while triangle tops are perfect for those with a smaller bust.
One-piece swimsuits: Focus on styles with built-in support, like wide straps or underwire, if you need extra lift or shaping.
