My friend says it's comfortable, but only my shoulders are stiff... The difference in jacket set-in sleeves revealed at the Seongsu-dong exhibition
My friend says it's comfortable, but only my shoulders are stiff.

My friend says it's comfortable, but only my shoulders are stiff... The difference in jacket set-in sleeves revealed at the Seongsu-dong exhibition
In places like galleries in Seongsu-dong where you stand for a long time admiring artwork, the comfort of a jacket is surprisingly important. You might have worn similar jackets with a friend, only to find that one feels comfortable while the other feels stiff in the shoulders. Both products have straight shoulder lines and a luxurious appearance, so where does the difference lie?
In reality, the way the sleeves connect to the bodice can affect the fit more than the shoulder width. In particular, understanding the structure of set-in sleeves allows you to choose similar-looking women's jackets using slightly different criteria.
The reason why the women's jacket at the Seongsu-dong exhibition is uncomfortable even though the shoulder line fits.

A tailored jacket in a deep color like deep plum pairs well with the exposed concrete walls and high ceilings of the Seongsu-dong gallery. With its straight shoulder lines and clean lapels, the design has a strong presence even in settings like art exhibitions where excessive formality is not required.
However, the fact that the jacket's shoulder line is in place is merely information regarding the visible fit. In reality, the arms move in various directions around the shoulder joint, and the jacket sleeves must wrap around that movement with three-dimensional curves. Therefore, even with the same size 66, the fit can vary depending on the pattern.
If you have found a jacket with the right shoulder width, it is worth considering the completeness of the design and comfort when moving as separate criteria. This is because the tailoring method used to create a neat appearance does not provide the same fit for every body type.
What are set-in sleeves on women's jackets? Why sleeve cap height changes the fit.
Set-in sleeves are a method where the sleeve is cut separately from the bodice and sewn to the armhole circumference. The boundary where the sleeve begins at the shoulder is distinct, making it commonly seen in standard single-breasted blazers or tailored jackets.
The key element to note in this structure is the sleeve cap. It refers to the rounded curve at the top when the sleeve is laid flat. Depending on the height and the shape of the curve, the way it wraps around the shoulder changes, and it also creates differences in the silhouette as the sleeve falls downwards.
Designs with relatively high sleeve caps, like traditional tailored jackets, are ideal for creating a smooth line from the shoulder to the sleeve when the arms are naturally lowered. This adds appropriate dimensionality around the shoulders and preserves the jacket's distinctive structural shape. However, jackets designed with a low-arm posture to accommodate high sleeve caps may feel restrictive when raising the arms significantly.

Lowering the sleeve cap doesn't solve all the problems. Changing the height alters the sleeve's curve and the remaining space, which can cause wrinkles to form when the arms are down or disrupt the expected tailored silhouette. The subtle allowance allocated during the sewing of the cap also has an impact.
As such, the sleeve cap is not simply a part to compare height. It would be more accurate to understand it as a design element related to how the shape connecting the shoulder to the sleeve is created.
Wouldn't a loose-fitting jacket with deep armholes and wide sleeves be more comfortable?
When choosing a jacket, it is easy to assume that a size larger will be more comfortable. However, designs with armholes that drop excessively low can cause the fabric to feel like it is being pulled up onto the body when you move your arms. This means that having a lot of fabric remaining under the armpits does not necessarily mean it is comfortable to move around in.
Armhole depth and sleeve width are different measurements. The armhole determines the shape and depth of the part of the bodice where the arm enters, while the sleeve width relates to the space available for the upper arm inside the sleeve. Even if the armhole is appropriate, a narrow sleeve width that wraps around the upper arm can cause pressure, whereas designing the armhole too high can cause discomfort in the underarm area.
Especially in autumn, people often wear knitwear under jackets. The space inside the sleeves is bound to feel different when wearing a thin long-sleeved top compared to layering a thicker knit.
If you choose a structured design like a deep plum wool blend jacket, it is more practical to consider the sleeve width based on the thickness of the clothes you will wear underneath, rather than simply whether it is an oversized fit or true to size. This will help you understand why some jackets look roomy in the shoulders but feel tight only in the upper arms.

If you find it inconvenient to open an exhibition catalog, check the direction of your jacket sleeves.
At galleries in Seongsu-dong, people often open exhibition catalogs to read or examine artwork descriptions on the walls up close. If a jacket feels uncomfortable in this posture where you bring your arms in front of your body, it is worth comparing the sleeve pitch and the back width.
Sleeve pitch refers to the front-to-back direction in which the sleeve is attached to the bodice. Since everyone's arms naturally rest in a different direction, if the sleeve does not align well with this, diagonal pulling wrinkles or twisting may appear in the fabric.
It is a good idea to compare this part in the store. Put on the jacket and let your arms hang comfortably to check if the sleeves are twisted excessively forward or backward. Next, try bringing your hands naturally together in front of your chest. If the upper back feels excessively taut or the entire sleeve feels twisted, it is worth comparing it to another jacket of the same size. Of course, you cannot conclude that there is a problem with the sleeve pitch based on just a single wrinkle.
You also need to check the width of the back panel separately. In particular, if there is insufficient room in the upper back, you may feel a pulling sensation at the back of the jacket when extending your arms forward. If the discomfort occurs only when bringing your arms together, the width of the back panel, as well as the direction of the sleeves, can be a potential cause.
Another structure worth knowing is the two-piece sleeve. Among set-in sleeves, there is also a tailored design created by joining two pieces of fabric. This method is ideal for creating a three-dimensional curve that fits the slightly bent shape of the elbow. This means that set-in sleeves and two-piece sleeves are not opposite types.
If you are choosing a jacket to wear to an exhibition at a store, why not try bringing your arms forward as if you were reading an exhibition catalog, rather than just trying it on? This can help you distinguish patterns that fit more comfortably, even with the same shoulder width.

Seongsu-dong Gallery Women's Autumn Jacket: Which One Also Offers Comfort?
How about wearing a deep plum wool blend single-breasted jacket on the day you visit an exhibition with friends at a gallery in Seongsu-dong? It features lapels that aren't too wide and thin shoulder pads, paired with an off-white long-sleeved knit sweater. Adding stone gray straight-leg slacks and dark brown loafers makes the jacket's deep purplish hue stand out even more vividly.
Deep plum and stone gray differ in color temperature and brightness, making them excellent for revealing the jacket's silhouette. If the sleeves fall smoothly along the direction of the arms, it can become a piece you want to wear for a long time. Understanding why there is a difference in how the same shoulder width looks when worn creates details that catch your eye before the price tag.
[In-house Production] (MADE) Two-Button Classic Single Jacket Autumn Jacket jk2997
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Walking Overfit PU Leather Half Collar Jacket 2 colors Spring/Autumn Long Loose Fit Single J.Flow

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