Blouse can be altered up to 2 sizes plus or minus since the blouse comes with a 2-inch garment margins on both sizes. By opening one stitch it can go one size up and by opening two stitches, it can go up by two sizes. Similarly, if the blouses has to reduce by one size then one stitch on both sides will do the needful or two stitches for two sizes down will do the needful. Ex. Blouse size 34” can be altered up to 32 or 36 inches.