Where Skill Meets Certification and Excellence is Recognized

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Various tailor and sewing certification badges displayed together.
A person cutting fabric with scissors on a pattern.

Our Mission

The American Tailors and Sewing Association (ATSA) is a national organization committed to promoting tailoring excellence in the art and craft of custom tailoring across the United States.

Our mission is to offer high-quality education, hands-on training, and nationally recognized certification programs for professionals in the tailoring, alterations, and garment construction industries.

Contact Us

Better yet, attend our certification workshops at major buying markets!
Certifying craftsmanship. Defining industry standards in American tailoring and showcasing our commitment to custom tailoring and tailoring excellence.

American Tailor

  • Mon - Fri: 9:00 AM – 5:00 PM (EST)
    Sat & Sun: Closed

Course Content - Enroll in Complete Tailor Certification

1

Hemming & Trouser Breaks

.1 Vocabulary Fill-In-The-Blank
Terms include:

  • Break
  • Grainline
  • Facing allowance
  • Cuff
  • Rise
  • Leg opening
  • Blind stitch
  • Press line
2

2.2 Diagram Labeling Exercises
Line-art diagrams for students to label:

  • Trouser anatomy diagram
  • Break levels chart
  • Hem fold diagram
  • Cuff construction diagram

2.3 Measuring Practice Sheet
Students record:

  • Full, half, quarter, and no-break measurements
  • Shoe height inclusion
  • Stance notes

2.4 Hands-On Assignment Log
Three hemming tasks documented with:

  • Garment ID
  • Desired break
  • Marking technique
  • Fabric type
  • Before/after evaluation

2.5 Self-Assessment Checklist
(Aligned with instructor rubric)

2.6 Module 1 Quiz
10–15 questions

3

Waistband, Seat & Tapering

3.1 Vocabulary

  • Seat ease
  • Hip rotation
  • Taper line
  • Waist supination
  • Pitch imbalance

3.2 Diagram Labeling

  • Seat curve diagram
  • Side seam taper lines
  • Waistband anatomy

3.3 Practice Exercise
Students take “before” photos and mark:

  • Waist reduction
  • Seat shaping
  • Taper blends

3.4 Tapering Worksheet
Step-by-step blending practice with drawn lines.

3.5 Module 2 Quiz

4

Jacket Sleeves & Cuffs

4.1 Vocabulary

  • Sleeve pitch
  • Sleeve crown
  • Sleeve break
  • Cuff vent
  • Surgeon cuff

4.2 Diagram Labeling

  • Sleeve pitch diagram
  • Sleeve crown diagram
  • Jacket armhole anatomy

4.3 Sleeve Adjustment Practice
Mark three sleeve adjustments:

  • Too long
  • Too short
  • Pitch imbalance

4.4 Surgeon Cuff Simulation Page
Students draw:

  • Button placement
  • Button spacing
  • Vent direction

4.5 Module 3 Quiz

5

Jacket Body Alterations

5.1 Vocabulary

  • Collar roll
  • Back seam
  • Side seam contour
  • Balance point
  • Posture compensation

5.2 Diagram Labeling

  • Jacket balance diagram
  • Collar roll correction illustration
  • Side seam blend lines

5.3 Alteration Analysis Worksheet
Students evaluate:

  • Shoulder slope
  • Body posture
  • Drape
  • Length adjustment

5.4 Module 4 Quiz

6

Measurement Standards Workshop Worksheets

6.1 Accuracy Checklist
Checklist to ensure correct measuring procedure.

6.2 Pinning Diagrams
Students draw pin placement for:

  • Bridal
  • Menswear
  • Suits
  • Formals

6.3 Communication Log with Tailor
Practice writing clear alteration tickets.

6.4 Workshop Quiz

7

Sewing Mastery Module Worksheets

7.1 Machine Identification Diagram
Students label:

  • Needle plate
  • Bobbin area
  • Tension disc
  • Feed dogs
  • Foot lever

7.2 Stitch Analysis Worksheet
Students evaluate:

  • Tension
  • Balance
  • Stitch length

7.3 Fabric Behavior Chart
Fill-in comparison:

  • Wool
  • Cotton
  • Polyester
  • Stretch fabrics

7.4 Sewing Mastery Quiz

8

Final Exam

A comprehensive 40-question exam that covers:

  • Hemming
  • Tapering
  • Jacket work
  • Measuring
  • Machine mastery
9

Certification Submission

A final page where students sign and submit to request ATSA certification.

Professional tailor in stylish workshop

Men's Tailoring and Measurement Standards Certification

Why Your Store Needs This Training NOW.

The industry is facing inconsistent measures, costly remakes, customer dissatisfaction, and a shortage of qualified staff.

ASTA establishes the national standard for measuring, fitting, and alterations—giving your store the professional edge today's clients expect.

Contact Us Today

Enroll your team who measures, including the managers and the tailor, so that everyone can implement the national standards, making communication seamless.

Certification Bridal

Consulting Measurements

The industry is facing inconsistent measures, costly remakes, customer dissatisfaction, and a shortage of qualified staff.

ASTA establishes the national standard for measuring, fitting, and alterations—giving your store the professional edge today's clients expect.

Consolation

We dive into the must-have review to give you the best possible information to maximize all alterations needed with the details needed to alter to perfection without guessing.

The Hem

From removing the lace to adding horsehair and all of the variables in-between, this course covers it all.

Bustles and Additions

We help businesses mitigate risks associated with international trade by providing comprehensive compliance solutions. Our services include trade compliance audits, risk assessments, and training programs.

Corsets and Bodice

From proper corset alterations and body changes, ATSA sets the unwavering standards. Our step-by-step certification certifies your skill set to perform the normal and the abnormal changes a bride will want to make.

Sleeves and Additions

All of the details are covered. Adding cap sleeves, offering full sleeves with appliques, adding modesty panels, adding buttons all the way down the train, and even inserting pockets. This certification will professionalize your skill sets.