Women’s swimsuits fall into three main categories: one-piece suits, two-piece suits (bikinis and tankinis), and specialty styles like monokinis and swim dresses, each designed for different coverage, support, and activity needs.
Standing in front of a wall of swimsuits, the sheer number of options can feel overwhelming before you’ve touched a single hanger. The difference between a cutout one-piece and a monokini isn’t always obvious at first glance, and the line between a sporty bikini and a tankini changes depending on who you ask. Before you start shopping, knowing the actual categories and what each one actually does for your body and your day at the beach makes the whole process faster and more satisfying.
The Main Categories of Women’s Swimsuits
The swimwear industry groups women’s suits into three foundational buckets, with specialty styles branching from each one.
- One-piece swimsuits are a single garment covering the torso and bust. Subtypes include strapless, scoop neck, V-neck, asymmetrical, cutout, blouson, lace-up, cross-back, ruffle-sleeved, swim dress, monokini, fringe, fauxkini, sporty, and rash guard styles.
- Bikinis are two-piece sets with a separate top and bottom. Common top shapes include triangle, scoop, halter, underwire, bandeau, balconette, sports bra, one-shoulder, bustier, and keyhole. Bottom shapes include high-waisted, hipster, Brazilian, hot shorts, and board shorts.
- Tankinis are two-piece suits with a tank-style top and bikini bottom, offering more midsection coverage than a bikini while keeping two-piece convenience for bathroom breaks.
Within these categories, specialty styles like the monokini — designed by Rudi Gernreich in 1964 as a hybrid with cutouts that creates a bikini-like visual effect while remaining one garment — and the swim dress, which has the silhouette of a mini-dress with an attached skirt, add further variety for specific preferences.
What To Look For In Each Style
Knowing the names helps, but knowing what each style actually does for your day matters more. Here is how the most common styles perform in practice:
- Strapless and bandeau styles minimize tan lines and are often flattering for smaller chests, but may be less secure during active swimming — consider a convertible option with removable straps if you plan to move much.
- Underwire and padded suits are support-focused, especially for larger cup sizes. Padded suits give breasts shape and support, while underwire suits add bra-like lift. Fit depends heavily on cup size and construction, so trying them on or checking the return policy matters.
- Tankinis fully cover the tummy while supporting the bust, making them a coverage-friendly middle ground for women who want more midsection coverage without committing to a full one-piece.
- Swim dresses and skirted suits are fuller-coverage options suitable for those wanting more thigh coverage or a modest silhouette. They are one-piece suits with an attached skirt or dress-like overlay.
- Rash guards and long-sleeve suits are used for UV protection and surfing. These prioritize coverage and practicality over styling, and are a good choice for extended time in direct sun or water-sport activity.
- Sporty and athletic swimwear is designed for movement, support, and staying in place during swimming or watersports. The exact level of security varies by brand and cut, but the overall construction prioritizes function over fashion.
How To Choose Based On Activity
Your intended use should guide your choice more than any other factor. For lounging and minimal water contact, strapless, bandeau, and cutout styles work fine and offer the most styling variety. For active swimming, lap swimming, surfing, or paddleboarding, prioritize sporty two-piece suits designed to stay in place during watersports, or full-coverage rash guard suits that won’t shift.
Two-piece suits with separately sold tops and bottoms allow customization for body type and activity, and are also more convenient for bathroom breaks than one-piece suits. If you are between sizes or have a different top and bottom size, this option is worth the extra effort.
When you’re ready to see specific products in these categories, our top-rated women’s bathing suit picks show exactly which styles and brands deliver on support, coverage, and durability for different needs.
For fit guidance, the REI swimsuit guide recommends focusing on the suit’s construction and your planned activity rather than just the style name. Strapless and bandeau styles may be less secure for some body types during active use — their styling and tan-line benefits are emphasized over performance stability in the retailer’s literature.
FAQs
What is the difference between a monokini and a one-piece?
A monokini is technically a one-piece garment, but it has cutouts that create a bikini-like visual effect, revealing sections of the torso. A standard one-piece covers the entire torso and bust in a continuous garment without intentional cutout sections.
Are tankinis more supportive than bikinis?
Tankinis offer more midsection coverage than bikinis because the tank-style top covers the stomach. For bust support, tankini tops vary widely — some include underwire or padding similar to bikini tops, while others have a looser fit. Check the specific top’s construction rather than assuming tankinis are more supportive.
What swimsuit style is best for swimming laps?
Sporty and athletic swimsuits are best for lap swimming. Look for one-piece suits or performance two-piece suits with secure straps, no dangling ties, and fabric designed for chlorine resistance. Rash guards work for open-water swimming but may create drag in a pool.
References & Sources
- REI Co-op. “Swimsuit Expert Advice.” Covers style categories, activity fit guidance, and construction considerations.
- Wikipedia. “Swimsuit.” Provides the historical taxonomy, style definitions, and the monokini’s 1964 origin.
- Lands’ End. “Swim Fit Guide.” Details the differences between one-piece, tankini, skirted, and specialty suit styles for different body types.