The following videos support the written instructions for the Classic Shirt pattern.
1. HOW TO SEW THE SHIRT PLACKET (standard long sleeve option):
2. HOW TO SEW THE SHIRT YOKE using the Burrito method:
3. HOW TO COMPLETE A FULL BUST ADJUSTMENT (FBA)
The Classic shirt and Classic Shirt Dress patterns are designed for a "C" cup. If your bust is a "D" or larger, you can either size up or do an FBA. Sizing up will often result in a shirt that is too large across the shoulders. Completing an FBA is much easier than it sounds, and you will end up with a much better fitting garment. Your alternative is to look at the "iGathered Shirt and Shirt Dress" sewing pattern which has significantly more ease in the bust (and will not require an FBA).
HOW TO ATTACH SNAP FASTENERS on your shirt or shirt dress