What size am I if I am 5′9″, 72 kg, 38″ chest?

Shirts and polos: M. Trousers: 32 or 34 depending on where you carry weight. T-shirts: M. Shackets: M. Your build is the median of our user base, so the standard medium is drafted for almost exactly you.

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Sizing

Size Guide — Built for the Indian Male Frame

Q: Is your sizing the same across all categories?

Yes. If you are M in our shirt, you are M in our polo, M in our T-shirt and M in our shacket. Trousers are sized by waist inches rather than letters. Cross-category consistency is the whole reason we draft in-house.

The Indian male body is not the Western or Korean body. Our patterns are drafted by NIFT-trained pattern makers around real torsos. Use this guide to find your true Sigma Code size in under three minutes.

Updated May 2026

Sizes look small on paper. They are not — they are drafted for the Indian male frame. Average chest, average rise, slightly higher armhole. Use the charts below, then read the “between sizes” note at the end. If you take ten minutes with a measuring tape, you almost never have to return.

In 30 seconds

Measure across the fullest part of your chest (shirts, polos, T-shirts, shackets) and around your natural waist (trousers). Find the matching cell. If you are between two sizes, size up for shirts and polos, down for trousers. Free 7-day return if the fit is wrong.

Shirts — size chart

Pure-cotton shirts in regular and slim drafts. Measurements below are garment dimensions (not body) — the standard Indian apparel convention. Half-chest doubled gives garment circumference.

Size	Chest (in)	Shoulder (in)	Sleeve (in)	Length (in)	Body fits
S	40	17.0	24.5	28.5	36–38
M	42	17.5	25.0	29.0	38–40
L	44	18.0	25.5	29.5	40–42
XL	46	18.5	26.0	30.0	42–44
XXL	48	19.0	26.5	30.5	44–46

Polos — size chart

Heavyweight 220+ GSM cotton polos with a structured collar. Drafted to sit slightly closer to the body than the shirt, with a shorter overall length so it stays tucked or sits cleanly untucked.

Size	Chest (in)	Shoulder (in)	Sleeve (in)	Length (in)	Body fits
S	40	17.0	8.5	27.5	36–38
M	42	17.5	8.7	28.0	38–40
L	44	18.0	9.0	28.5	40–42
XL	46	18.5	9.2	29.0	42–44
XXL	48	19.0	9.5	29.5	44–46

Heavyweight T-shirts — size chart

200+ GSM combed cotton, structured set-in sleeve. Drafted to hold the shoulder line through the day so it never looks slouchy after the third meeting.

Size	Chest (in)	Shoulder (in)	Sleeve (in)	Length (in)	Body fits
S	39	16.5	8.0	27.0	36–38
M	41	17.0	8.2	27.5	38–40
L	43	17.5	8.5	28.0	40–42
XL	45	18.0	8.7	28.5	42–44
XXL	47	18.5	9.0	29.0	44–46

Stretch trousers — size chart

Mid-weight stretch cotton with the Indian-frame rise. Sized by waist in inches, finished with a 32-inch base inseam (we offer free 4-inch alteration credit on the first order if needed; ask on WhatsApp).

Size	Waist (in)	Hip (in)	Thigh (in)	Rise (in)	Inseam (in)
28	28	37	22.0	11.0	32
30	30	39	22.5	11.2	32
32	32	41	23.0	11.5	32
34	34	43	23.5	11.7	32
36	36	45	24.0	12.0	32
38	38	47	24.5	12.2	32

Shackets — size chart

Structured shirt-jackets cut slightly relaxed at the chest so the layer underneath (shirt or T-shirt) sits cleanly. Length runs 1 inch longer than the standard shirt for the right hip-line on the AC floor.

Size	Chest (in)	Shoulder (in)	Sleeve (in)	Length (in)	Body fits
S	42	17.5	25.0	29.5	36–38
M	44	18.0	25.5	30.0	38–40
L	46	18.5	26.0	30.5	40–42
XL	48	19.0	26.5	31.0	42–44
XXL	50	19.5	27.0	31.5	44–46

How to measure yourself at home

You need a flexible tailor’s tape. If you don’t have one, use a soft cord and measure the cord against a steel rule afterwards. Five measurements cover every garment we make.

01 · Chest

Across the fullest part, under the armpits.

Wrap the tape horizontally around your torso at nipple level. Keep it flat, snug but not pulling. Breathe normally and read the number. This is your body chest — the chart maps it to the right garment chest.

02 · Shoulder

Bone to bone across the back.

Stand straight, arms relaxed. Measure from the bone at the outer edge of one shoulder, across the top of your back, to the same bone on the other side. The seam of a well-fitting shirt sits on these two points.

03 · Sleeve

From shoulder bone to the base of the thumb.

Arm slightly bent. From the same shoulder bone above, measure down the outside of your arm, past the wrist, to the base of the thumb. This is full sleeve length — the cuff should hit just past the wrist bone when standing.

04 · Waist (trousers)

Around the natural waist, not the hips.

Find the narrowest part of your torso — usually 1 to 2 inches above the navel. Measure horizontally, snug but able to fit one finger underneath. This is your body waist. Trouser size matches body waist almost exactly; the stretch absorbs the rest.

05 · Inseam (trousers)

Crotch to the top of the heel.

Stand barefoot against a wall. Measure from the crotch seam of well-fitting trousers (or your inner thigh, if measuring on yourself) straight down to where the trouser hem should land — usually the top of the heel bone. Our 32-inch base inseam fits the 5′7″ to 5′10″ range; ask on WhatsApp for shortening.

If you are between two sizes

The single most-asked question. The answer depends on the garment.

Shirts — size up. A shirt that pulls at the chest looks worse than one that drapes slightly. The cleaner option is always the looser one.
Polos and T-shirts — size up if you wear a vest underneath; size down if you want a sharper drape across the chest.
Trousers — size down. The stretch absorbs 2–3 inches of give. A trouser one size too loose sags at the hip and pools at the ankle — both unfixable.
Shackets — size up. The layer underneath needs room.

Our fit philosophy — why we draft this way

Most international brands draft on a 6′1″ Western or 5′11″ East Asian fit model. The average Indian male professional is closer to 5′8″ with a slightly different shoulder-to-hip ratio, a marginally higher armhole, and a torso that runs 1–2 inches shorter than the international standard.

Our patterns are drafted by NIFT-trained pattern makers around three Indian-frame fit models — one for the 5′6″–5′8″ range, one for 5′9″–5′11″, and one for 6′ and above. The grading between sizes accounts for the way Indian men actually carry weight (more at the waist than the chest), so the medium that fits your friend who is 4 inches taller will not feel right on you, and that is by design.

Fit is the single largest determinant of how a garment makes you look. We treat it as engineering, not styling.

FAQ — size and fit

How do Sigma Code shirts compare to Snitch or Bombay Shirt Company?

Our regular fit runs slightly looser at the chest and slightly shorter at the body than Snitch’s slim fit, which is drafted closer to the Korean-frame template. Compared to Bombay Shirt Company’s made-to-measure baseline, ours runs closer to their “Indian fit” preset — mid-armhole, mid-rise, drape over taper. If you take L at Snitch, take L with us; if you take Bombay Shirt Company’s Indian fit medium, take M with us.

What size am I if I’m 5′9″, 72 kg, 38″ chest?

Shirts and polos: M. Trousers: 32 or 34 depending on where you carry weight (32 if waist is closer to 31, 34 if closer to 33). T-shirts: M. Shackets: M. Your build is the median of our user base, so the standard medium is drafted for almost exactly you.

Will the shirt shrink after the first wash?

Our pure-cotton fabrics are pre-shrunk before stitching. Expected first-wash shrinkage is under 1.5% on length (under 0.4 inches on a 28-inch shirt) and effectively zero on chest. Wash cold, dry inside-out in shade, and the garment holds its dimensions for the life of the cotton.

What if the size I ordered doesn’t fit?

Free 7-day return on unworn, tags-on garments. Initiate the return from your account page or on WhatsApp; we arrange the pickup. Refund or exchange — your choice. We pay return shipping on size-related returns.

Do you do made-to-measure or custom alterations?

Not yet on the storefront. We can shorten or lengthen the trouser inseam by up to 4 inches on a first order if you message us on WhatsApp within 6 hours of placing it — included in the price. Bigger alterations (waist, taper, shoulder) are on the 2026 roadmap.

Is your sizing the same across all categories?

Yes — if you are M in our shirt, you are M in our polo, M in our T-shirt and M in our shacket. The only category we ask you to verify separately is trousers, which is sized by waist inches rather than letters. Cross-category consistency is the whole reason we draft in-house.