Start your sewing adventure with us.

Join Seamwork


No. 3126


Downloadable digital pattern

Seamwork members can download new patterns like Bertie each month. Membership starts at just $16.00 per month!

Join Seamwork Now

Free download for Seamwork members.

Not ready to join yet? Buy Bertie now for $16.00.

  • Fabric & Supplies

    Light to medium weight woven fabrics such as shirting, chambray, flannel, lawn, voile, rayon challis, rayon crepe, Tencel poplin, Tencel twill, and silk crepe.

    All-purpose polyester sewing thread, sewing machine needle, 1 1/8 yards (1 meter) of lightweight fusible interfacing, eight or nine 3/8" (10 mm) buttons, 1 3/8 yards (1.3 meters) of 1/4" (6 mm) braided elastic. 26" (66 cm) o 1/4" (6 mm) double fold bias tape, small hook and eye Small safety pin

    0 – 26

  • Sizing & Fit

    Our Misses patterns are drafted for a C cup and our Curvy patterns are drafted for DD. Both are drafted for a height of 5'8" (172 cm).

    0 – 26

    We want to help you achieve the best fit possible so you can sew garments you truly love. Our fit guides are designed to help you better understand the fit and details of each pattern. Use fit guides in conjunction with the finished measurement chart to better understand the ease and intended fit of each pattern.

  • Details

    This pattern is a digital download. When you purchase a PDF pattern from Seamwork, your new pattern will be stored in your download library, where you can download it as many times as you like.

    Our pattern PDFs are layered for easier printing.

    Print-at-home files, copy shop files, and instructions. See contents file in download for detailed descriptions.

    Teaching a class using Bertie? Purchase a bulk license for your classroom here.

    Teaching a class using Bertie?

    We love seeing Seamwork patterns in the classroom! A bulk license will allow you to print as many copies of your pattern as you need for your students.

    Please also review our teaching terms and conditions.

Pattern Extras

Bertie Bonus

This month’s bonus variation offers 3/4-length sleeves with cuffs.

Download here

You May Also Like

  • Ruth

    A straight skirt and a notched collar are the kind of details that you'll find on a classic dress pattern.

  • Killian

    This dress won’t ever go out of style. The Killian dress features a classic silhouette with a fitted bodice, V-neckline, and gathered skirt, closing with buttons up the front.

  • Marlow

    The Marlow shirt is an ideal short-sleeved button-up.