Let's make a bra: toile/muslin
Before using proper fabric, it can be helpful to sew a toile to get familiar with the pattern and do a first round of fit adjustments. You might want to make a toile with cups and band, or you might prefer to start with a fitting band and then work on cups separately. For a basic toile without elastics
How to sew a bra muslin
Beginner Bra Making Series - Welcome
Lesson 1 - Cutting Out and Sewing Up Your Calico Toile/Muslin. - 1
Custom Fit Clothing: 10 Reasons to Make a Muslin for
How to Get the Most Out of Your Muslin Toile
Curvy Opinion: One or Two Muslins is Enough
Anna Dress Bust Help : r/sewing
Instant Download PDF Lingerie Sewing Pattern for an Underwire Bra
Let's make a bra: construction