With many years of experience designing golf apparel, I’ve created my fair share of plaid repeating patterns.  It’s quite easy to mock up a quick one in Illustrator:

And if you want to take it one step further, you can add a specific weave structure, such a twill, using Photoshop:

Make sure you understand the basics of plaids (wovens) – some of the basic terminology can help you communicate your design ideas and manufacturing needs to others with my FREE Ultimate Guide to Fashion Industry Terms and Abbreviations!

Related posts:

Anatomy of Argyle Patterns The 20 Best Illustrator (& Photoshop) Repeating Pattern Tutorials Lace Brushes & Swatches in Illustrator & Photoshop