Square Neck One Piece Swimsuit

What a Square Neck One-Piece Is

A square neck one-piece swimsuit cuts the front neckline as a straight horizontal line across the collarbone — no curve (scoop), no dip (sweetheart), no full band (high neck). The line sits at or just below the collarbone and frames it.

What the Pool Carries

• Set-strap square necks — the line with fixed shoulder straps.
• Adjustable-strap square necks — the line with a dial-in fit.
• Lined-cup cuts — the front panel stays smooth under the straight line.

14 styles, from about $34.

The Line and the Fit

• The straight line reads cleanest when the cups sit smooth — lined or fitted.
• The horizontal line frames the collarbone; it is the quiet option next to an o-ring cut or a high neck band.
• The waist can be natural or belted — a thin belt at the natural waist is the classic 90s finish.
• The shoulder seam carries the fit; if a style slips, it is the strap, not the neckline.

How to Shop This Collection

• Decide the strap type — set for a set silhouette, adjustable for a dial-in fit.
• Check the cup construction — lined or fitted keeps the front panel smooth.
• Style it 90s — a thin belt, simple hoops, an open-front cover-up. Keep the neckline bare.
• Like the line in a two-piece? Our square-neck bikini tops carry the same collarbone cut on a top.

Quick Answers

Q: Is the square neck a 90s or Y2K thing? A: The straight collarbone line is a signature of 90s swim and resurfaced in the Y2K revival — it is one of the named neckline trends in the current cycle.

Q: Square vs scoop vs sweetheart? A: Square is a straight horizontal line; scoop is a curved U; sweetheart is a V-shaped dip at the center top.

Q: Will it work for swimming? A: Yes — the set collarbone line and stable shoulder seam mean it sits still in the water. It is a coverage preference, not a performance feature.