How To · Fashion · Build
Master the essential tailoring basics that transform outerwear fit
A well-tailored jacket is the foundation of any wardrobe. These five fundamental adjustments—and when to make them—will transform how your outerwear fits.
5 min read · IrisTailoring isn't mysterious—it's math applied to fabric. Whether you inherited your mother's wool coat or finally found a blazer you love, knowing which adjustments matter most will save you money and frustration. A tailor can't add fabric where none exists, but they can work miracles with proportion and placement.
This guide covers the five moves that matter: sleeve length, shoulder seams, jacket body, lapels, and hem. Master these, and you'll know exactly what to ask for—and what to expect to pay.
A tailor can't add fabric where none exists, but they can work miracles with proportion and placement.
What you'll need.
- 01Measuring tape (soft, flexible)
- 02Pins or tailor's chalk
- 03Mirror (full-length)
- 04A friend or second set of eyes
- 05The complete outfit you'll wear the jacket with
Step one · 2 minutes
Measure sleeve length correctly
Stand with arms relaxed at your sides. Your sleeve should end at your wrist bone, with about a half-inch of shirt cuff visible. Measure from the center back neck seam, across the shoulder, down the arm to that point. Mark this measurement with a pin or tailor's chalk. This is the single most noticeable alteration—too-long sleeves read unfinished, while too-short ones look childish.
Wear the shoes you'll pair with the jacket when you get measured. Heel height affects posture and, therefore, sleeve length.
Step two · 1 minute
Check shoulder seam placement
The shoulder seam should sit exactly where your shoulder ends—not drooping down your arm or perched on your collarbone. Put on the jacket and have someone mark where the seam currently sits relative to your actual shoulder point. If it's more than half an inch off, it needs moving. This is structural work; expect to pay more, but it's worth it because it affects how everything else hangs.
Shoulder adjustments require taking apart and resewing seams. Not all tailors do this well—ask for references if you're unsure.
Step three · 2 minutes
Assess the jacket body fit
Button the jacket and look at the front. You should be able to fit one flat hand between the jacket and your body at the waist. If it pulls or gaps significantly, the body needs adjustment. Mark any pulling points with pins. Taking in the side seams is straightforward; letting out is only possible if there's seam allowance (usually one inch) hidden inside. Check the back too—excess fabric bunches near the shoulders or spine are red flags.
Never let a tailor take in more than half an inch per side seam. Beyond that, you're fighting the garment's design.
Step four · 1 minute
Evaluate lapel and collar roll
The lapels should lie flat against your chest without curling or gaping. If they're pulling away, the jacket may be too tight in the chest, or the lapels need steaming and pressing to reset their shape. If they're bunching, the jacket might be too loose. This is often a fit issue rather than an alteration issue—but a good tailor can adjust the lapel's roll by carefully repositioning internal stitching.
Before paying for lapel work, try having the jacket professionally pressed. Sometimes that's all they need.
Step five · 2 minutes
Mark the hem length
For a blazer, the hem should hit mid-hip or just below, covering the top of your pants. For a coat, it typically ends at the knee or slightly below. Put on the jacket with the pants or skirt you'll wear it with, and have someone mark the hem with pins while you stand straight. The hem should be even all around—check the back and sides, not just the front. A tailor will measure up from this mark to ensure consistency.
Hem length is the easiest alteration to reverse if you change your mind. Ask your tailor to leave extra fabric folded inside if possible.
How to know your tailoring worked.
A well-tailored jacket should feel invisible—it moves with you, doesn't pull or gap, and makes you look intentional rather than like you're wearing someone else's clothes. The seams should align with your body's natural lines, and the proportions should feel balanced.
Questions at the mirror.
Can a tailor fix a jacket that's too small in the chest?
Only if there's seam allowance to let out (usually one inch hidden inside the side seams). If the jacket is already at its limit, it's not salvageable. Ask your tailor to check before committing.
How much does tailoring typically cost?
Sleeve hems run $20–$40. Side seams cost $40–$80. Shoulder adjustments are $60–$150. Structural work like moving lapels can exceed $200. Get a quote before proceeding.
Should I get everything altered at once?
Yes. Alterations affect each other—changing sleeve length might shift how the shoulder seam sits. A good tailor will account for this, but doing it all at once ensures consistency.
What if my tailor suggests alterations I didn't ask for?
Listen, but don't feel obligated. A tailor's job is to flag issues, but you decide what matters. If they're pushy about expensive work you don't need, find someone else.