5 cm Briefs vs Bikini Bottoms: Which Cut Fits Your Day?
By Marlies Dekkers Lingerie & Swimwear | Published: 2026-10-16
Category: Comparisons
Compare 5 cm briefs and bikini bottoms on side width, coverage, and adjustability, with fit guidance for each cut and honest trade-offs.
Quick answer
Choose 5 cm briefs when you want a fixed, slightly wider side and nearly full coverage that stays put under clothing. Choose bikini bottoms when you want a narrower, lower-cut look and more adjustability, especially at the hips. Neither cut is universally better; the deciding factor is how much coverage you want and whether you prefer a set side width or ties you can tighten.
What the 5 cm side actually changes
A 5 cm side measures roughly two inches from the top of the brief to the leg opening. That extra width sits higher on the hip than a classic bikini string side, so the brief anchors against the hipbone instead of pulling from a thin strap. The practical result is less shifting when you sit, bend, or walk, and a smoother line under fitted trousers or a skirt.
The trade-off is visual: a wider side covers more of the hip and can interrupt a high-cut leg line. If your main goal is elongation through the leg, a narrower side usually reads longer. If your main goal is a brief that stays where you put it, the 5 cm side is the more reliable choice.
How bikini bottoms differ in cut and adjustability
Bikini bottoms cover the same three areas as briefs, but the side is typically narrower and the rise sits lower. Many styles add ties at the hips, which lets you set the tension yourself rather than accepting a fixed measurement. That adjustability matters most if your hip and waist measurements fall in different size bands, or if you want a looser fit at the beach and a snugger fit under clothing.
The trade-off runs the other way here: ties can loosen with movement, and a narrow side offers less surface area to grip the hip. If you dislike retying or adjusting through the day, a fixed side is simpler. If you want to fine-tune where the bottom sits, ties give you options a fixed cut cannot.
Coverage in the back and front
Coverage is not only about the side width. The back cut determines how much of the buttocks is covered, and the front rise determines how high the waistband sits. A 5 cm brief with a fuller back covers more than a bikini bottom with a skimpy back, even if their side widths were identical.
When you compare two styles, read the coverage description rather than assuming from the name. Some bikini bottoms are described as providing comfortable coverage for the buttocks, groin, and hips, which is fuller than the word bikini might suggest. If a listing does not state back coverage, treat that as a gap in the information and check the product images or ask before buying.
Trade-offs to weigh before you choose
- Stability vs leg line: A 5 cm side grips the hip and shifts less through the day, but it covers more of the hip and can shorten the visual leg line compared with a narrow side. Pick the 5 cm side if staying put matters more than elongation.
- Adjustability vs simplicity: Hip ties let you loosen or tighten the fit, but they can work loose with movement and need occasional retying. Pick ties if your measurements sit between sizes; pick a fixed side if you would rather not adjust.
- Detail vs versatility: Cut-outs, charms, lace trim, and prints make a piece distinctive, but textured or embellished edges can show under thin, tight clothing. Match the level of detail to what you will wear over it.
Two cuts, side by side
- 5 cm briefs: 5 cm briefs with 5 cm sides, recycled microfiber fabric, back cut-outs, and metal coin-shaped charms in a range of sizes and shapes. The fixed 5 cm side gives nearly full coverage and a stable fit, while the cut-outs and charms add detail that shows if the brief is visible above a waistband.
- 5 cm bikini bottom: 5 cm bikini bottom in rubine red recycled fabric with a digital print, described as providing comfortable coverage for the buttocks, groin, and hips. A useful middle option: bikini styling with fuller stated coverage, so you get the lower-cut look without giving up coverage in the back.
- tie and bow bikini bottom: Tie and bow bikini bottom in sea green ton sur ton fabrics, one matte and one glossy, with adjustable ties on both hips and a formfitting shape lined with recycled fabric. The hip ties let you set the fit yourself, which suits anyone whose hip and waist measurements do not match a single fixed size.
- high waist briefs: High waist briefs with a streamlined silhouette, a printed motto beneath the lining, spider web details, and lace trim, part of a limited edition. A different coverage answer entirely: full waist coverage rather than a side-width decision, useful if you want control at the midsection.
Which cut is best for you
Best for
- Anyone who wants nearly full coverage and a side that stays in place under clothing
- Wearers whose hip and waist measurements fall within one size band
- Days that involve a lot of sitting, walking, or layering over swimwear
Not for
- Shoppers prioritizing the longest possible leg line, who should look at a narrower side
- Wearers between sizes who need to tighten or loosen the hip fit through the day
