I love this idea for keeping a loose neckline in place.
Maddie gives useful guidelines for armholes. I'm always excited when someone can explain something technical and make it easy to understand. I don't mind putting in some work to learn new things, but there is a reason I didn't go to school to learn pattern drafting - sewing is a hobby for me, not a job.
Sigh. If only I could make myself do the work to figure out an armhole/sleeve that works with my body, I could make something like these colorful jackets.
I don't think I could do it in 30 minutes, but I like this idea for altering a blazer. I also like her hair in the second photo.
When I was active in Delta Omicron, I needed a white dress. I wish I had one that looked like this.