Both armhole and sleeves as well as the shoulder seam are very closely connected, and must harmonize. No matter in what position we choose to place the different parts of a frock or sack while cutting, they must all assume the same position at and around the armhole and shoulders when on the body. The question of locating the front of the armhole is solved in the application of the angle of 135 deg. The normal form has its arms at the center and side of the body, and Dia. [I] has its armhole in its center and side. If the old rule—front of armhole ⅔ half-breast from back—holds good, then the back of the armhole must also be equally good at ⅔ half-breast from the front base, as in Dia. [I]. There is no question but that the armhole may be made more or less without injury to the fit as long as the sleeve fits into the armhole. The front of the armhole is located two seams back of 45 deg., from the starting point, and on the front base, as shown in Dia. [VII]. This gives an easy-fitting armhole for a well-built form, but if the armhole is cut forward to meet the front sleeve base, it will not injure the coat.

It is generally claimed that a stooping form requires its armhole more forward, and an erect form more backward, but this is not always true. We find plenty of forms which bend the back, and throw the neck downward in front, but throw the arms and shoulders backward, and which forms do not require their armholes forward of the normal position. We also find forms which are very erect or straight in the back but throw their arms forward, and do require the armholes forward from the normal position. Now, no matter if the form is erect or stooping, the armholes do not require to be larger or smaller. Because a man throws his arms forward or backward does not show that his arm becomes larger or smaller. If the armhole is required to be cut ½ an inch more forward the back should be that much wider. If the armhole is cut ½ an inch backward the back becomes ½ an inch smaller—the location of the armhole changes, not the armhole.

A cutter must also take into account the occupation of a customer. A musician who blows a great horn requires his armholes backward, and a full breast, while a person who plays the violin requires his armholes pretty well forward, or, at least, he needs extra length in the back sleeve seam, no matter if it is a trifle loose when the sleeve drops downward. But if everything is well balanced it is wonderful how small, and again how large, an armhole a man can have in his coat and feel good in either of them. But as stated, the sleeve must fit into the armhole, and for this reason we must consider the sleeve in particular.

When one or both arms are thrown into a horizontal position they show themselves as a sidewise growth of the body, like the limb of a tree, and consequently have their base in the center of the back, or in the center of the front. For the purpose of permitting the arms to drop down to the side, a wedge, or gusset, or a lap, is made between the top of the armhole and sleeve, which is taken up when the arm drops down into its natural position at the side.

At 60 deg. from the center of the back the sleeve and the shoulder lap 2¼ numbers for a close-fitting sleeve, and it is so shown in Dia. [VII] and [X]. At 45 deg. from the back, or at the top square line from the front base, the sleeve and shoulder lap 2 numbers. While the lap of 2 at 45 deg., may be considered as a permanent thing for all sleeves, the lap at 60 deg. may be considered as changeable, according to the style of the sleeve head, or according to the kind of the coat, as over or under coats. The lap of shoulder and sleeve, at 60 deg., also depends upon a low or a square shoulder, as well as upon a broad or a narrow style of the shoulder. Two and a quarter may be taken as the smallest amount to be allowed at 60 deg., and 2½ may be considered not too much for any style, and 2¾ may be considered plenty for a very full sleeve head and a narrow style of shoulders.

At right angles with the center of the back and through the point of the angle of 135 deg., is the front sleeve base, to which the front sleeve seam is connected at point 11, and from which line the normal form requires the front of armhole backward 2 seams, as in the position of Dia. [VII], and which is intended for a close-fitting armhole. On the back the center of the sleeve is 8 from the point of the angle of 135 deg., and there the sleeve and the coat connect even, and there the sleeve length must be transferred.

In taking the sleeve length it makes no difference if the length is taken 1 inch higher or lower, but in transferring the measure to the sleeve, the cutter must know where to transfer, no matter where the seam may be located. After the front and back are formed the top sleeve may be made wider on either seam, and the under side that much smaller, and notches cut accordingly.

Sleeve and back are to be connected at 8 numbers from O, and at the back base, but this is for normal forms only, or for the normal position of the arm only. Persons whose occupation compels them to throw their arms forward should have some surplus cloth at that point even if the sleeve shows too much cloth when the arms hang down. Surplus length allowed there must not be accounted for in the sleeve length. Another good way, to provide such sleeves with extra length at the back seam, is to throw the front seam of the sleeve, say 1 in. forward of the base and at the hand, which will cause the sleeve to extend forward easily with the arm. Such sleeves may also have more width at the elbows. Persons who most always reach forward with their arms should also have a trifle allowance, say ¼ inch, at the shoulder blade, and between the back and sidepiece, at line 9 over the front.

The bottom of the armhole is marked ¾ above lines 9 and 11¼ and the front of the armhole is ⅜, or two seams back of the angle of 45 deg., all of which must be considered a close-fitting armhole, but there is no law to prevent the armhole to be cut ⅛ to ¼ deeper and that much more forward.