1. Print at 100% scale — do NOT select "Fit to Page." Use "Actual Size."
2. Verify the scale — measure the 1" check square below. It must be exactly 1 inch.
3. Cut out each pattern piece along the dashed lines.
4. Trace onto cardboard — cereal boxes or poster board work great.
5. Cut your cardboard templates — these are your reusable cutting guides.
6. Pin template to fabric, trace, and cut with ½" seam allowance INCLUDED.
Fabric Needed Per Top: ~½ yard of swim fabric (4-way stretch lycra/spandex) Also Needed: Swim elastic (¼"), adjustable sliders (2), rings (2), hook clasp (1)
Pattern Pieces Per Top (cut each piece TWICE — one for each side):
Piece A — Triangle Cup
The main triangle that covers the bust. Cut 2 (mirror image). Seam allowance is included.
Piece B — Cup Lining
Same shape as Piece A but ¼" smaller on all sides. Cut 2. Provides structure and opacity.
Piece C — Neck Strap
Long strip that ties behind the neck. Cut 1 (or use fold-over elastic).
Piece D — Band Strap
Goes under bust and ties at back. Cut 1 (or use fold-over elastic).
Assembly: Sew lining (B) to cup (A) right sides together, turn, topstitch. Attach cups to band. Add neck straps to cup tops. Thread straps through sliders for adjustability.
La'Bri
Triangle Cup — Piece A (Outer)
Small — A to B Cup
Small — Measurements
Cup Width (base)
6 inches
Cup Height (apex to base)
5.5 inches
Cup Coverage
A – B cup
Seam Allowance (included)
½ inch all sides
Neck Strap Length
24 inches × 1 inch
Band Strap Length
48 inches × 1 inch
La'Bri
Triangle Cup — Piece A (Outer)
Medium — B to C Cup
Medium — Measurements
Cup Width (base)
7 inches
Cup Height (apex to base)
6.25 inches
Cup Coverage
B – C cup
Seam Allowance (included)
½ inch all sides
Neck Strap Length
26 inches × 1 inch
Band Strap Length
52 inches × 1 inch
La'Bri
Triangle Cup — Piece A (Outer)
Large — D to DD Cup
Large — Measurements
Cup Width (base)
8 inches
Cup Height (apex to base)
7 inches
Cup Coverage
D – DD cup
Seam Allowance (included)
½ inch all sides
Neck Strap Length
28 inches × 1.25 inches
Band Strap Length
56 inches × 1.25 inches
⚠️ Large uses wider straps (1.25") for extra support
La'Bri
Strap Patterns — All Sizes
Strap Cutting Guide: Cut straps on the lengthwise grain for stability. If using fold-over elastic (FOE) instead of fabric straps, skip these pieces and use ⅝" FOE.
Straps shown here are reference measurements — cut to the lengths below. Width includes seam allowance for fold-and-stitch construction.
Neck Strap — Piece C (Cut 1 per strap, 2 total)
Small
24" long × 2" wide (folds to 1")
Medium
26" long × 2" wide (folds to 1")
Large
28" long × 2.5" wide (folds to 1.25")
Band Strap — Piece D (Cut 1, goes under bust)
Small
48" long × 2" wide (folds to 1")
Medium
52" long × 2" wide (folds to 1")
Large
56" long × 2.5" wide (folds to 1.25")
Assembly Order:
1. Cut 2× Piece A (cups) and 2× Piece B (linings) per size
2. Place lining (B) on cup (A), right sides together
3. Sew along both side edges and top point, leaving bottom open
4. Turn right-side out, press, topstitch ⅛" from edge
5. Create a casing at the bottom of each cup for the band strap
6. Thread band strap through both cups
7. Attach neck straps at each cup's top point
8. Add adjustable sliders to neck straps
9. Add ring + hook closure at band strap ends
Pro Tip: Use a ballpoint/stretch needle and polyester thread. Zigzag stitch or stretch stitch only — straight stitch will pop when the fabric stretches!
Materials Checklist Per Top:
☐ Swim fabric (lycra/spandex, 4-way stretch) — ½ yard
☐ Swim lining fabric — ¼ yard
☐ Swim elastic, ¼" — 1 yard
☐ Adjustable strap sliders (½" or ¾") — 4 pcs
☐ O-rings (½" or ¾") — 2 pcs
☐ Hook clasp or tie closure — 1 pc
☐ Polyester thread (matching color)
☐ Ballpoint/stretch sewing needle