Continuing with the "Fitting Dresses" booklet from the U.S. Department of Agriculture.
Wrinkles form in front and back of blouse below the arm. The sleeve may also have lengthwise wrinkles under the arm. These fitting difficulties arise when the blouse is too narrow or fitted too closely at the underarm seam and in the armhole. The figure may have a roll of flesh directly under the arm and extending to the back.
Release the armhole seams of the blouse to give more room across the bust. If the armhole is too snug, carefully clip it at intervals at the tight places. Avoid clipping too deep or beyond the seam allowance. Examine the fit of the lower half of the armhole. If the armhole in the blouse was slightly eased into the sleeve around the lower half, wrinkles may result. Rip out the sleeve and refit the lower half of the armhole.
Sleeve cap twists to the front or back. When a sleeve cap twists to the back, the crosswise grain of the goods in the cap pulls down in the back and up in the front. The lengthwise grain slants toward the back at the top. On the other hand, when a sleeve cap twists to the front, the crosswise grain of the goods in the cap slopes up to the back and lengthwise yarns slant toward the front at the top.
The sleeve may have been set into the wrong armhole. Or perhaps, when cutting out the sleeve, the pattern was not laid correctly with the grain of the goods. Twisting to the back may be caused by too much fullness at the back of the sleeve cap. Or perhaps the sleeve pattern was too short at the back, or there is not enough room for the elbow. The shoulder bone on the figure may be more prominent than was allowed for by the pattern. Twisting to the front may be caused by too much fullness at the front of the sleeve cap.
Check the sleeve with the pattern, noting the location of the notches in the sleeve cap and armhole. Check the marks for the elbow. If the sleeves are in the wrong armholes, exchange them, and fit again.
If a sleeve has not been cut correctly on the grain of the cloth, no amount of fitting will prevent twisting. The best solution is to recut the sleeve. This may mean changing the style of the sleeve if material is limited.
If too much fullness has been put toward either the back or the front of the sleeve, rip the top half of the armhole seam, and shift the fullness, bringing the lengthwise yarns into the right position. (See Figure 15)
When many changes are needed, rip the sleeves from the armhole and fit the sleeve while the dress is on the figure. (see information for Figures 17 and 18).
Underarm sleeve seam twists to the front or back. If the underarm sleeve seam pulls the top of the sleeve to the back, the back underarm sleeve seam may be too short or the elbow fullness incorrectly placed. If there is plenty of elbow fullness, rip the seam and release some of the fullness, pushing it up higher. This gives more elbowroom and helps to straighten the grain of the goods between the elbow and armhole.
If the lower armhole seam twists to the front it may be because there is not enough room at the elbow. rip the seam below the elbow. Push additional fullness into the elbow darts or gathers. Pin and fit the lower part of the sleeve. This will shorten the sleeve and you may have to change the sleeves to a three-quarter length.
Back of blouse pulls at armhole line. The sleeve bins. At the narrow part of the back, crosswise wrinkles extend from the armhole toward the center of the back (figure 20 A). The wrinkles may also extend across the sleeve cap. The dress may be too narrow across the back.
When the armhole seam allowance permits, let out both the back and the sleeve.
If the wrinkles occur on in the back of the blouse at the armhole curve, the sleep cap may not be deep enough. In other words, the back armhole line is too long for the depth of the sleeve cap. In addition, the sleeve is probably too small for the armhole. To give more depth to the sleeve cap, rip out the sleeve from the armhole and raise the lower or under half of the sleeve cap (Figure 20 B). The extra material on the sleeve seam should be trimmed out after, and not before, the armhole seam is completed. Pin, baste, and refit.
Armhole tight with crosswise wrinkles in the blouse from armhole and lengthwise wrinkles extending down at undersleeve. Such wrinkles (Figure 21 A) occur when the armhole is too tight or too high at the underarm. Or the sleeve may be too tight at the armpit level.
If the armhole is too snug, rip out the sleeve, and mark a new armhole line. Refit the sleeve into the new armhole line, keeping the crosswise grain straight across at the armpit level.
Sometimes the armhole is too high at the underarm, yet the sleeve fit is well over the top of the arm. To adjust this, rip the armhole stitching under the arm, baste a new, lower seam line (Figure 21, B). Try on the blouse again. If necessary, trim out the armhole a little to test the fit. If the sleeve is too tight, let it out as much as possible. Extra fullness can be eased into the upper half of the sleeve cap.