Taunton's Threads - For people who love to sew
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From the pages of Threads magazine Everyone Can Have Jeans That Fit Here's how to alter the pattern
Jeans fit differently than trousers The current jeans style is close-fitting, with a contoured front waistband and a shaped yoke in back. The top edge of jeans these days comes right to your waistline, or about 1/2 inch below it. Jeans hug your body everywhere, including in the crotch curve, which on an average fitted trouser is about 1/2 inch from your body, and about 1 inch away on pull-on pants. There are three typical leg styles of modern jeans: straight-leg, tapered, and boot-cut. Straight-leg jeans fit to the hip but fall almost straight down from there. Tapered and boot- cut jeans fit snugly to the knee, but boot-cuts flare out below the knee (to allow room for boots underneath), while tapered legs continue to taper to the hem. To get all these features, you need a good pattern. I prefer Burda 8408, or a pattern I designed for Vogue #7608, shown here, which ranges in size for a 34- to a 57-inch hip. Since these patterns are multisized, check the sizing chart to see what size you should use for your waist and hip measurements. If you need to combine sizes, use a highlighter to outline the sizes you’ll be using, making smooth transitions between the waist and hip areas. If you have a small waist and full hips, choose the size that will give you the circumference you need over the hip, tapering in a size or two at the waist. If the waist is still too large, reduce the back yoke and front contoured waistband by folding out small wedges, as shown below, to bring in the waist. If you have short legs, taper to a smaller size from the knee to the hem for better proportions. Finally, check the pattern’s total crotch-length measurement by measuring the front and back curves, and include the height of the waistbands and back-yoke pieces of your total measurement. Measurements you’ll need The measurements you need are listed below. If you like your jeans tight, you should take a snug measurement of your full hips, pulling the tape measure so that it cinches your hips as described. If you prefer a more relaxed fit, take the same measurements, but be sure to maintain minimal ease around your hips. Another measurement that’s very handy to have, if possible, is the length of the crotch seam from a pair of pants that fits you comfortably in that area. If any of your trousers are the right length from crotch to waist, regardless of how they fit (or don’t fit) elsewhere, measure the front and back crotch curves as shown below, and use these as references for your new jeans. If you simply don’t have any pants that fit well, measure your figure from center-front waistline to center-back waistline between your legs. The drawings below will walk you through the process of altering your jeans based on these measurements. Just remember that if the total crotch measurement is different from the pattern, that doesn’t tell you whether you need to add or subtract in the front, back, or both, so refer to all the drawings for guidance or make a muslin to see where the problem is. Below, you’ll find advice for fitting specific body contours that are independent of measurements. Have fun wearing your new jeans!  Taking measurements for jeans Take all the indicated measurements with minimal ease, unless you want tight-fitting jeans, in which case take a hip measurement that cinches in the body by about 1 inch. Take the full thigh sitting down with the tape measure near the crotch. To find the crotch length, measure either a comfortable pair of pants as shown below, or the figure, from waistline to waistline between the legs.   To begin, adjust the pattern to match your measurements and desired leg style You can make the following adjustments on your pattern. To be sure the results fit as you wish, make a muslin sample and try it on. To make the waist bigger or smaller: Reshape the yoke and waistband If blending to a different size at the waistline doesn’t help, slash the front waistband and the yoke pieces vertically several times, from the top edge to the opposite seamline, leaving a paper hinge, then overlap the slashes equally until the combined upper seamline is half the needed waistline length. 
To lengthen or shorten the legs: Adjust above and below the knees  To find the length adjustment needed, compare your measured length to the pants length on the envelope back for the hip size you’re using. Divide the length adjustment in half; spread or overlap the pattern by this amount both above and below the knee level. Smooth the affected seamlines. To change the style of the leg:  Redraw the seamlinesYou can customize the leg style and the hem circumference on any pattern by adding or reducing one-quarter the desired difference at the hemline at each vertical seamline and drawing new seams that taper from these points to wherever you want the width to be unchanged, typically somewhere between the knee and hip levels. To shorten or lengthen the crotch: Reshape the front and back separately Compare your crotch measurement (taken from your figure or from a favorite pair of pants) to the pattern measurement. If there’s a difference, alter the front and back individually, adding or subtracting at midcurve. You can also make small changes to the waist or inseam positions if those are typical problem areas for you. 
Specific body shapes require individual pattern adjustments The following alterations aren’t always indicated by measurement differences, but your experience with other pants, or with a jeans muslin made at this point, may tip you off to their necessity.  Protruding or flat seat:Move the back inseam out or in For a protruding seat, slash the pattern and spread as much as 3/4 inch; more will create a baggy seat. For additional room, lengthen the crotch as described above. For a flat seat, overlap the pattern in the same place instead. For either case, taper to nothing below the knee. Very flat seat:  Use a smaller back pattern If your pants always have a baggy seat, cut the back leg pattern a size smaller, adding to the waist and high hip if needed. You can also, or alternatively, horizontally slash and overlap the back by 1/2 inch below the crotch, tapering to nothing at the side seamline. In either case, stretch the back inseam between knee and crotch when sewing it to the pants front.  Full thighs: Move the front inseam out To see how much to add, compare your full thigh measurement plus 1 inch to the thigh measurement on the pattern. If your pants are always tight across the front of the leg, slash the pattern vertically through the crotch and spread, tapering to nothing by the bottom of the leg. To increase the leg circumference overall, add equally to the inseams and side seams on both front and back.  Knock knees: Straighten the inseam at the knee If your knees rub together, straighten out the curve on the inseam of both the front and back legs to get the extra fabric you need.  Protruding back calves: Lengthen and widen the lower back leg If your close-fitting pants always get hung up on the back calf, slash the pattern as shown, leaving a paper hinge at the vertical seamlines, then spread to create a 1/2- to 3/4-inch space in the midcalf area.
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