Why You Should Size Down When Buying Franco Marine Swimwear
One of the most common questions we receive at Franco Marine is: should I order my usual size or size down? The answer, for Franco Marine pieces, is almost always: size down one size from your usual clothing size.
Here is exactly why — and how to get the most flattering, longest-lasting fit from every piece in the collection.
The Reason: Franco Marine Uses Premium High-Stretch Nylon-Spandex
Every Franco Marine bikini and one-piece is crafted from a premium nylon-spandex blend with a high concentration of elastic spandex fibres. This is not standard swimwear fabric — it is a performance-grade, high-stretch material specifically chosen for its ability to:
- Expand significantly to accommodate your body shape when worn
- Recover fully to its original shape after each wear — maintaining its sculpting fit season after season
- Mould to your body like a second skin, creating the smooth, flattering silhouette Franco Marine is known for
- Provide compression and support — the tummy control in BUCO, the sculpting waistband in ALTO, and the shaping ruching in KAREEN all rely on the fabric's elastic tension to work correctly
Because of this high stretch factor, a Franco Marine piece that looks small on the hanger will expand to fit your body perfectly when worn — and a piece ordered in your usual clothing size may feel loose, less supportive, and less flattering than intended.
What Happens If You Order Your Usual Size
If you order your standard clothing size in Franco Marine swimwear, you may find:
- The fabric feels looser than expected and does not provide the sculpting, second-skin fit it was designed for
- Triangle tops (YARA, TIO) may gap at the cups even when the ties are fully tightened
- High-waist bottoms (ALTO, BUCO) may not provide the tummy control and waist definition they are designed to deliver
- One-pieces (MARE, MASSIMA, KAREEN) may feel less structured and supportive than intended
- The piece may lose its shape more quickly over time, as the elastic fibres are not under the correct tension
In short — ordering too large means the fabric never reaches its optimal stretch tension, and the piece never performs as designed.
What Happens When You Size Down
When you order one size smaller than your usual clothing size in Franco Marine:
- The high-stretch nylon-spandex expands to fit your body perfectly — creating a smooth, second-skin silhouette with no gaps or loose areas
- The elastic fibres are under the correct tension — delivering the tummy control, sculpting, and support the piece was designed to provide
- Triangle tops sit flush against the body with no gaping — even during active movement, swimming, and water sports
- High-waist bottoms (ALTO, BUCO) deliver their full tummy control and waist-defining effect
- One-pieces (MARE, MASSIMA, KAREEN) feel structured, supportive, and flattering from every angle
- The piece retains its shape longer — because the elastic fibres are working within their optimal stretch range
Sizing Down by Collection: Franco Marine Specific Guide
YARA Triangle Bikini Sets (Grey, Orange, Glossy Knit)
YARA's shiny nylon-spandex has excellent stretch and recovery. Size down one size from your usual clothing size. The adjustable ties allow you to fine-tune the fit once on.
ALTO High-Waist Bikini Sets (High-Leg, Orange, Deep V)
ALTO's tummy control high-waist bottoms rely on elastic tension to sculpt and smooth. Sizing down ensures the waistband sits correctly and delivers its full shaping effect. The plunge V-neck top also benefits from a snugger fit for security during swimming.
BUCO Bikini Sets
BUCO's sculpting design works best when the fabric is under correct elastic tension. Size down one size for the most flattering tummy control and silhouette-defining fit.
TIO Triangle Bikini Sets (Crochet Lace & Jacquard)
TIO's jacquard fabric has slightly less stretch than standard nylon-spandex. Size down half a size if possible, or stick to your usual EU size if you are between sizes. The adjustable ties provide additional fit flexibility.
RUFF Push-Up Bikini Sets (Green, Grey, Convertible)
RUFF's underwire construction is sized similarly to a bra. Size down one size in the bottoms. For the top, use your bust measurement as the primary guide — the underwire provides structure that limits stretch in the cup area.
MASSIMA Belted One-Pieces (White, Green, Orange)
MASSIMA's jacquard fabric has moderate stretch. Size down one size — the adjustable belt allows you to define the waist independently, giving you additional fit flexibility even after sizing down.
MARE One-Pieces (Deep V, Open Back, Evening Gown)
MARE's shiny nylon-spandex has excellent stretch. Size down one size confidently — the adjustable metal straps and leather hardware allow you to fine-tune the fit once on.
KAREEN One-Pieces (White, Green, Orange)
KAREEN's ruching and cutout design work best when the fabric is under correct elastic tension. Size down one size for the most flattering sculpting effect and the most secure fit around the cutout areas.
TIA Collection (Bandeau, Sporty, Reversible Bottoms)
TIA's nylon-spandex has excellent stretch. Size down one size across all TIA styles. For the TIA Bandeau, a snugger fit is especially important for a strapless style to stay securely in place.
The Simple Rule: Franco Marine Sizing in One Sentence
Order one size smaller than your usual clothing size — the premium high-stretch nylon-spandex will expand to fit your body perfectly, delivering the sculpting, second-skin silhouette Franco Marine is designed to create.
Frequently Asked Questions
How much does Franco Marine swimwear stretch?
Franco Marine's premium nylon-spandex blend stretches approximately one full EU size — meaning a piece that measures EU 36 on the hanger will comfortably fit an EU 37-38 body when worn. This is why sizing down delivers the best fit and longest-lasting shape.
Will sizing down feel too tight?
No — because the fabric is designed to stretch. A Franco Marine piece in the correct (sized-down) size will feel snug when you first put it on, but will quickly mould to your body shape and feel like a second skin within minutes of wearing. If it feels genuinely uncomfortable or restricts movement, it may be too small — in which case, size up.
Does this apply to all Franco Marine collections?
Yes — with a small exception for jacquard-heavy styles (TIO crochet lace, MASSIMA jacquard) which have slightly less stretch. For these styles, sizing down half a size or sticking to your exact EU measurement is recommended.
What if I am already ordering the smallest size (XS / EU 34)?
If you are already ordering XS, order your true EU size. XS is the smallest size in the Franco Marine range and is designed to fit EU 34 bodies with the correct elastic tension already built in.
Quick Reference: Franco Marine Sizing Rule
- Order one size smaller than your usual clothing size
- The high-stretch nylon-spandex expands to fit your body perfectly
- Sizing down delivers tummy control, sculpting, and second-skin fit as designed
- Exception: jacquard styles (TIO, MASSIMA) — size down half a size or order your exact EU measurement
- Already ordering XS? Order your true EU size
- Still unsure? Contact the Franco Marine team for personalised sizing advice
Ready to find your perfect fit? Explore the full Franco Marine collection — bikini tops, bikini bottoms, and one-piece swimsuits — all crafted from premium European high-stretch fabrics designed to sculpt, support, and flatter.