The Sienna — Black One-Piece Swimsuit

Elegant, confident and effortlessly timeless, The Sienna is a sophisticated black one-piece swimsuit designed for women who love clean lines, a flattering silhouette and a statement back.

The sleek black design creates a classic luxury look, while the figure-hugging construction follows the body beautifully. The open-back detail adds a touch of femininity and gives this swimsuit a more distinctive fashion-forward finish.

Made in the UK, each swimsuit is individually printed, cut and sewn by hand, giving every piece the attention to detail expected from premium handmade swimwear.

✦ Fabric Options

Choose between:

Recycled Slinky Matt Lycra
A smooth, supportive fabric with a sophisticated matte appearance and a comfortable figure-hugging fit.

Soft Sheen Lycra
A softer, slightly luminous finish with additional stretch and movement. This option is recommended if you prefer a more flexible or less restrictive fit.

Both fabric options are designed for comfortable movement and are suitable for swimwear.

✦ Fully Lined

The swimsuit is fully lined with a soft, fine mesh fabric for additional comfort, coverage and a premium finish.

You can choose your preferred lining colour where available during the design process.

✦ Made to Order

Every The Sienna swimsuit is made specifically for your order.

The process includes:

• Printing the design
• Hand cutting the fabric
• Sewing the swimsuit
• Applying a premium zigzag stitch
• Quality checking before dispatch

There are no minimum orders, making each swimsuit individually produced rather than mass-produced stock.

✦ Sizes: XXS–7XL

The Sienna is available in an extensive range of sizes from XXS through 7XL, including plus sizes.

Because this is a tight, figure-hugging garment, please carefully compare your measurements with the chart below before ordering.

If you prefer a looser, more flexible fit, Soft Sheen Lycra is recommended because it provides greater stretch and movement.

Size Chart
Size    Bust    Waist    Hips
XXS    25–28"    18–21"    28–31"
XS    28–31"    21–24"    31–34"
S    31–35"    24–28"    34–37"
M    35–38"    28–31"    37–41"
L    38–41"    31–34"    41–44"
XL    41–44"    34–37"    44–47"
2XL    44–49"    37–42"    47–52"
3XL    49–54"    42–46"    52–56"
4XL    54–58"    46–51"    56–61"
5XL    58–63"    51–56"    61–66"
6XL    63–68"    56–61"    66–70"
7XL    68–72"    61–65"    70–75"
How to Measure

For the best fit, measure your body directly with a flexible measuring tape.

Bust: Measure around the fullest part of your bust.

Waist: Measure around your natural waist — the narrowest part of your torso.

Hips: Measure around the fullest part of your hips and buttocks.

Compare your measurements with the chart above before selecting your size.

✦ Sustainable Production

The Sienna is produced using a made-to-order model, helping avoid unnecessary overproduction and excess inventory.

The fabric is sustainably printed, and each swimsuit is produced only when ordered.

✦ Personalised Design

The swimsuit can be customised through the online design interface, allowing artwork to be positioned across the front and back of the garment.

Your design is automatically applied to the selected product, and the design interface provides tools to adjust the artwork before ordering.

A preview is provided before checkout so you can review your design.

✦ Production & Shipping

Production time: 1–2 days

Once production is complete, your swimsuit is prepared for shipping.

Quick shipping is available throughout the United States, with worldwide shipping options available depending on destination.

✦ Care Instructions

To keep your swimsuit looking its best:

• Turn inside out before washing
• Wash at 86°F / 30°C
• Use low tumble-dry heat if necessary
• Do not wring
• Iron on low heat
• Iron on the reverse side of the printed fabric
• Steam safe
• Avoid excessive heat

✦ Important Fit Information

This swimsuit has a close, body-hugging fit.

If you are between sizes, carefully compare your bust, waist and hip measurements before ordering.

For customers who prefer additional stretch and freedom of movement, we recommend selecting Soft Sheen Lycra.

Please check the size chart carefully before placing your order, as swimwear is a fitted garment.

black one piece
black swimsuit
one piece swimsuit
womens swimwear
open back swimsuit
luxury swimwear
black swimwear
womens swimsuit
figure hugging
made to order
plus size swimsuit
designer swimwear
uk made swimwear