Verified Open Pattern (1.0.0-published)

This pattern includes verified home printable specification files, dual-unit sizing charts, and full cutting guides. License: Drafted by Threadline Patterns. CC BY-SA 4.0 International..

Knit Tank Confident Beginner XS to 3XL (Bust 80–132 cm / 31.5"–52.0")

Racerback Workout Tank

The Racerback Workout Tank is an athletic wardrobe essential designed for gym, yoga, and summer running. Features deeply curved armholes that allow complete scapula freedom, an ergonomic racerback cut, clean knit-binding edge finishes, and a hip-length contoured hem.

Jump to Downloads Front & Back Views Size & Measurements Fabric & Tools Step-by-Step Instructions

Technical Garment Schematics

Front and back flats illustrating seam lines, hem curves, and design details.

Front Elevation

Back Elevation

Sizing & Measurement Tables

Review both body benchmarks and finished garment ease before cutting your cloth.

Measurement Unit

Toggle between metric and imperial values across all charts

1. Body Measurements Chart

Your physical body dimensions. Measure over undergarments with a snug tape.

Swipe sizes

Size	Bust	Waist	Hip
XS	80 cm	62 cm	88 cm
S	86 cm	68 cm	94 cm
M	94 cm	76 cm	102 cm
L	102 cm	84 cm	110 cm
XL	112 cm	94 cm	120 cm
2XL	122 cm	104 cm	130 cm
3XL	132 cm	116 cm	142 cm

2. Finished Garment Measurements Chart

Dimensions of the sewn garment, including designed wearing ease.

Swipe sizes

Size	Finished Bust	Finished Length	Bottom Hem
XS	76 cm	56 cm	84 cm
S	82 cm	57.5 cm	90 cm
M	90 cm	59 cm	98 cm
L	98 cm	60.5 cm	106 cm
XL	108 cm	62 cm	116 cm
2XL	118 cm	63.5 cm	126 cm
3XL	128 cm	65 cm	136 cm

Size Selection Guidance

Incorporate negative ease for a supportive sports fit. If between sizes, size up for comfort.

Wearing Ease Explanation

Negative ease of -4 cm (-1.6") to ensure tank stays in place during high-motion workouts.

Fabric & Materials

Recommended substrates, stretch allowances, yardage requirements, and required notions.

Recommended Fabrics

Athletic performance knits with 4-way stretch

Supplex nylon-spandex (220–280 gsm) for compression and durability
Polyester-spandex athletic jersey with moisture-wicking finish
Bamboo-cotton stretch jersey for soft low-impact yoga wear

Stretch Requirement: 50% 4-way stretch with 90%+ recovery

Notions & Sewing Tools

Ensure you have these ready before starting.

Notions:

Stretch ballpoint needle (size 75/11)
Wooly nylon thread for loopers (optional)
Polyester thread

Tools Required:

Sewing machine with stretch stitch or serger
Coverstitch machine (optional)

Fabric Yardage Requirements

Size Bracket	115 cm (45") Width	150 cm (60") Width
XS – M	1.2 m (1.3 yd)	0.9 m (1 yd)
L – XL	1.4 m (1.5 yd)	1.1 m (1.2 yd)
2XL – 3XL	1.6 m (1.8 yd)	1.3 m (1.4 yd)

Seam Allowances & Cutting Layout

Exact seam allowances included in pattern lines, piece list, and cutting discipline.

Standard Seams

0.8 cm (5/16 in) serger allowance.

Hem Allowance

1.5 cm (5/8 in) stretch hem.

Neck & Armhole

0.6 cm (1/4 in) for binding.

Pattern Pieces to Cut

Piece Name	Quantity & Orientation	Grainline / Cutting Notes
Front Tank Bodice	Cut 1 on fold	Straight of grain
Racerback Tank Bodice	Cut 1 on fold	Straight of grain
Knit Binding Strips	Cut 3 (neck & armholes)	Straight of grain

Fabric Cutting Checklist:

Cut binding strips across maximum stretch.

Printable Pattern Files

Download PDF files for home printing on standard desktop printers.

Download Pattern Files

1.0.0

Direct pattern downloads. No registration, email capture, or paywalls required.

Updated: 2026-03-01

Instructions Available

Complete offline sewing guidebook with dual calibration test squares, yardage charts, pattern piece cut list, numbered steps, and troubleshooting.

13.6 KB • 4 pages

Download (13.6 KB)

A4 Available

Full-scale 1:1 tiled master pattern for A4 paper (15 sheets). Includes dual 50mm/2.0in calibration boxes, assembly map, grainlines, and corner registration crosshairs.

97.2 KB • 15 pages

Download (97.2 KB)

US Letter Available

Full-scale 1:1 tiled master pattern for US Letter paper (15 sheets). Includes dual 50mm/2.0in calibration boxes, assembly map, grainlines, and corner registration crosshairs.

97.3 KB • 15 pages

Download (97.3 KB)

Printer Calibration Test Sheet (Free Single Sheet) 2.4 KB

Print at 100% scale (no fit-to-page) and measure the 50mm and 2-inch test boxes with a hard ruler.

Download Test Sheet

Print Instructions:

Open the downloaded PDF in Adobe Acrobat Reader or a dedicated desktop PDF viewer. In the print dialog, select "Actual Size" or "Custom Scale: 100%". Never select "Fit to Printable Area". Always measure the calibration square on Page 1 before proceeding.

These files are prepared from documented pattern references through a technical drafting workflow. If anything appears incorrect, unclear, or causes a sewing problem, email feedbacksewingpattern@gmail.com. Send pattern feedback.

100% Scale Verification

Print Page 1 at 100% scale without scaling. Check 50 mm (Metric) or 2.0 in [50.8 mm] (Imperial) test square with a hard ruler.

Read full printing & calibration guide →

Tile Assembly Instructions

Align numbered letter and row marks. Butt edges together without overlapping untrimmed paper.

Step-by-Step Sewing Instructions

Draft construction notes. Readable online; review against the pattern pieces before sewing.

Shoulder Seams

Align Front Tank Bodice and Racerback Tank Bodice right sides together. Stitch narrow racerback shoulder seams together with stretch stitch. Press seam allowances toward back.

Bind Neckline

Attach stretch binding to scooped front and back neckline. Turn to wrong side and topstitch with twin needle.

Bind Deep Racerback Armholes

Attach stretch binding to both armhole curves, gently tensioning around curves. Stitch and trim.

Side Seams and Hem

Align front and back bodices right sides together. Stitch continuous side seams with serger and press seam allowances. Turn up hem and topstitch with stretch stitch.