Create your own moderate cut string bikini bottom with adjustable side ties and center back ruching for a flattering, custom fit. This sewing pattern is designed for stretch fabrics and shows you how to achieve clean edges, smooth shaping, and adjustable string sides for the perfect fit. Designed for DIY swimwear, rave looks, and custom bikini styling, this pattern gives you control over coverage, fit, and finish while keeping construction simple and beginner-friendly.
This tie side string bikini bottom features a moderate cut back with ruching detail that enhances shape and contour. Adjustable side strings allow you to customize the fit, making it ideal for different body types and styling preferences. Whether you’re sewing for the beach, pool, or costume wear, this pattern delivers a clean, minimal look with maximum impact.
👀 View coordinating bikini tops
✨ Includes
XS–L sizes
Moderate cut back coverage
Color-coded sizing (NOT layered)
US Letter 8.5 x 11 format
Alignment blocks for easy page assembly
Test squares: 2″ (US) and 5.08 cm (metric)
🧵 What You Will Need
1/2 yard Nylon Spandex (2 & 4-Way Stretch)
Optional lining (same stretch)
2 binding strips 1 3/8″ x 1 yard
2 string pieces 18″ x 1 3/8″
6″ braided elastic (1/8″ or 1/4″) for ruching
Matching thread
Overlock/serger or home sewing machine with zigzag/stretch stitch
Binding attachment optional
🧵 Assembly (Shortened Instructions)
Create center back ruching using elastic and secure the ends. Attach lining to the main piece at the center seam and align edges. Secure side bindings and stitch to hold shape. Fold and stitch bindings to finish edges cleanly. Prepare string ties by folding lengthwise and attaching at marked points along front and back edges. Wrap and stitch strings to finish edges, ensuring even placement. Tie knots at string ends to complete the bikini bottom. Full step-by-step instructions are included in the downloadable pattern.
💻 Digital Download
Instant download PDF sewing pattern available immediately after purchase.
No physical item will be shipped.
Due to the nature of digital products, refunds and exchanges are not permitted.
🎥 Sewing Tutorial
Quickie tutorial available to guide construction.
