#24 How to Make a Cup Size Adjustment on a T-Shirt Pattern

If you’ve ever noticed gaping at the front armhole or drag lines across your bust in a t-shirt, chances are your knit pattern needs a cup size adjustment.

This is especially true if you’re above a B cup or prefer a looser fit—but even with stretchy fabric, a poor bust fit can affect balance, comfort, and appearance.

In this week’s video, I’ll show you:

• How to spot patterns that lack proper bust fitting
• Why knit garments still need bust shaping—even without darts
• How to make a full bust adjustment that avoids bulky shaping
• Where to distribute dart volume for a smooth, dart-free result
• When to adjust for length only (instead of both length and width)

You’ll see clear examples: one for managing small amounts of ease at the side seam, and another using a traditional bust adjustment adapted for knits. I’ll also explain how to blend added volume into the neckline, shoulder, and hem to maintain your garment’s original shape and style.

This method is ideal if you're working with the Jenny T pattern—or any simple knit top that lacks bust shaping.

Get the Jenny T and follow along.

Want a More Personalized Fit?
Learn how to draft your own stretch knit bodice using your body measurements.
The Custom Stretch Knit Bodice online course walks you through the full process.

Next week we'll chat about back contour shaping and how to manage rounded back fitting issues in knit garments. I hope you'll tune in.

All My Best,
Alexandra

PS
For more information on bust adjustments review these resources:

A New Take on the Full Bust Adjustment

Another New Take on the Full Bust Adjustment

How to Eliminate a Bust Dart

The Kimono Tee Small Bust Adjustment

The Cowl Tee Small Bust Adjustment

The Cowl Tee Full Bust Adjustment

The Belle Blouse Small Bust Adjustment

The Belle Blouse Full Bust Adjustment