"I created this online course for anyone with the desire of making their own swimwear (either as a hobby or as a business idea). I will teach you step by step how to master spandex fabrics to create beautiful one or two piece swimsuits. You just need basic sewing knowledge to take this course"


Tommie Hernandez

Fashion designer with over 25 years experience in

swimwear design and construction

Founder of Sirena Patterns

4th of July Flash Sale!

This online course will help you master spandex fabrics to create one piece swimsuits and bikinis, even if you only have a regular sewing machine. 



One piece swimsuit and bikini PDF patterns included (sizes XS to Xl)

Sharon Swimsuit PDF Pattern

80’s inspired suit has scoop neck and low back. Medium back coverage.

Fully lined with an additional shelf lining.

Juliana Bikini PDF Pattern

Bandeau top with neck tie. Fully lined. 

High waist, medium back coverage bikini bottom. Fully lined.

Get 4 amazing bonuses FREE! ($500 value)

Bonus #1
Dalila Tunic PDF Pattern

Three-quarter sleeve, scoop neck tunic has side slits. View B has contrast binding and cuffs.

Bonus #2
Private Facebook Community

Online community with other students where you can ask questions, share your projects and interact with people who love sewing.

Bonus #3
Melissa Sarong PDF Pattern

Beach cover-up ties at the side. Can be made in

either spandex or woven fabrics.

Bonus #4

Alterations for one piece swimsuits and bikinis


Use the patterns included as slopers (base patterns) to create your own designs!

  • Add removable cups
  • Create a draped panel
  • Add ties to shoulders or backs
  • Lower and lengthen a bikini bottom
  • Reduce or increase leg and back coverage


Here's what you'll learn:

  Welcome to the Course
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  Bonus #4 Access to Private Facebook Group
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  Materials
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  Before you Start Sewing Spandex Fabrics
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  Sewing Spandex Fabrics
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  What sewing machine should I use to sew spandex fabrics?
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  Sewing Patterns 101
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  Making a One Piece Swimsuit - The Sharon Pattern
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  Making a Bikini - Juliana Bikini
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  Bonus #1 - Alterations to a Swimsuit
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  Bonus #2 Melissa Sarong Pattern
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  Bonus #3 Dalila Tunic Pattern
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  How did it go?
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4th of July Flash Sale!

Here's what our students are saying:

Neysa Sosa

Great straight to the point explanations and the overall structure of the curriculum. Even though I work full-time, the convenience of being able to watch the videos at any time over and over makes it easy for me to keep learning. I love this course!

Karla Menéndez

I had never sewn a bathing suit because it seemed very complicated; but after taking this course, it is another world within my reach. The videos are excellent, accurate and in simple, easy-to-understand language as are the instructions. Not only that, Tommie is approachable and has created a community in the world of sewing, from which we all benefit.

Naida Ortiz

During the day I can carry out and fulfill my professional work and in the evenings become an online student doing what I always wanted. It is an excellent opportunity to learn from the comfort of my home at the time that I choose. The organization and techniques taught in this course are illustrated simple and are easy to understand.


Your sofa is your classroom

Access the course from anywhere! You only need Internet connection.

Access to the course 24/7

You don't have to start or finish on an exact date! Work at your own pace. Watch the videos over and over. You have access to the course 24/7.

Certificate of completion

You will receive a certificate of completion when you finish the course.

4th of July Flash Sale!