Hi, I’m an intermediate seamstress and about launch myself into learning a new set of skills. I want to find instruction on how to make different sizes from my vintage patterns (20’s, 30’s, 40’s). Obviously I can’t run out to the fabric store and pick up copes in larger sizes.
I am reading articles on slopers and understand the basic concepts. But I haven’t yet found any information that is specific to what I want to do–most focus is on altering a pattern based on a sloper, but not about actually grading up or down one to two sizes.
Conceptually, I’m thinking there should be a rough formula for adding inches to a bodice and it’s coressponding pieces (collars, waistbands, etc), but what I really want is a how-to series of steps with which I can start practicing.
For example, I made a sheath dress (with back center seam) and added 1/2 inch to the back, which added an inch in total. Then I added 1 inch to the collar so that the front, back, and collar peiecs would fit together without neededing to ease the back neckline into the collar. But how does this apply to changing the entire size of a garment?
Any leads, directions, or advice appreciated!