Quick answer: Front darts on a suit jacket are vertical or angled tucks in the front panels that help shape the waist; shops must say darted or undarted, and dart length, rather than assuming every shaped jacket uses darts. Write darted or clean front next to the waist-suppression level before the sample. Shi Yuan (Suit Factory) takes MTM from 1 and bulk from 50 per style for overseas tailor shops, MTM boutiques and private-label brands, not retail — send the darted-or-undarted choice and a front photo on WhatsApp.
An undarted sack style is a whole silhouette family covered in the sack suit undarted brief. This page is the narrower question: when a standard day jacket should carry front darts, and what to write so the sample matches.
What are suit jacket front darts?
Front darts are shaped stitched folds in the front panels, usually running from the chest or pocket zone toward the waist, that remove cloth and create waist shape. Side-seam suppression can shape the waist without front darts; many sharp day jackets use both. A clean undarted front reads softer or more sack-like even when the side seam curves.
Dart or no dart — decision table
ChoiceFront lookBrief risk if vagueFront dartsClear waist from the frontDart length and end point still neededClean / undartedSmooth front; sack or soft dayClient wanting sharp shape may rejectDarts plus side suppressionStrong tailored waistOver-shaping if both are extremePocket as dart cueSome houses use pocket placementMust still say dart yes or no
Same table as a list
Front darts: clear waist from the front — dart length and end point still needed.
Clean / undarted: smooth front for sack or soft day — a client wanting sharp shape may reject.
Darts plus side suppression: strong tailored waist — over-shaping if both are extreme.
Pocket as dart cue: some houses use pocket placement — must still say dart yes or no.
What else sits next to the dart line?
Waist suppression level, pocket style and cloth pattern matching. A deep dart on a bold stripe needs a matching note. Peak versus notch is unrelated to darts but often travels on the same sketch in peak versus notch lapel. Do not use darts to fix jacket balance; balance has its own brief.
Spec lines
Front: "front darts" or "undarted clean front".
Length: dart ends as on the house sketch.
Suppression: soft, moderate or strong as a separate line.
Pockets: flap, jetted or patch — keep pocket brief separate when needed.
Sample proof: "dart presence and length match sketch".
A worked note
"Client ref A-12. Day jacket with front darts, moderate waist suppression, side seams also suppressed. Not a sack block. Dart length per house sketch."
At the sample
Confirm darts are present or absent before discussing girth.
Check both fronts for matching dart length.
Look at stripe or check matching across the dart if the cloth has a pattern.
Separate dart comments from pocket comments.
Photograph the front buttoned for the approval note.
Private-label rule
If the brand's business block is always darted and the casual block is undarted, print that on the line sheet. Sales staff should not promise a sack front on a darted block. When a client brings a vintage undarted reference, open the sack brief rather than deleting darts silently on a shaped block.
Pattern matching across darts
Checks, stripes and windowpanes make dart placement visible. A dart that cuts a bold stripe without a matching plan will show as a broken line. If the cloth has a clear pattern, write whether matching across the dart matters and attach a sketch. Plain cloth still needs dart length, but matching noise is lower.
Pocket mouths near a dart can also fight the shape. If the house uses a slant pocket that crosses the dart zone, mark the intersection on the sketch. Do not leave the factory to invent a clean meeting point.
Teaching sales staff dart language
Avoid vague words such as more tailored when the real choice is darted or undarted. Show a darted front and a clean front on the same cloth family when possible. Let the client point. Then lock suppression level. A clean front with strong side suppression is a valid soft-tailored look; a darted front with soft suppression is another. The combination must be written, not assumed from the word tailored.
Sample feedback language that stays useful
Write "add front darts per sketch" or "remove front darts; keep side suppression moderate" rather than "make it more shaped". Shaped is not actionable. Dart presence, dart length and suppression level are actionable. If the cloth is patterned, add one matching sentence. That is enough for a clean remake note without reopening the whole silhouette.
Which track needs a front-dart lock?
MTM — from 1 piece: one client's jacket with darted or undarted written on his order.
Bulk — from 50 per style: a brand's style with dart presence sealed on the sample before bulk from 50.
The sample takes 7–14 days; production takes 14–21 days after measurements, cloth and construction are locked. Production days are not delivery days. How shops brief MTM jackets is on our made to measure suit factory page, and how the sample is judged on our sample policy page.
Send the darted-or-undarted choice and a front photo on WhatsApp +65 8013 8838 and we reply with what is still open.
FAQ
What are Shi Yuan's order tracks and clocks? Shi Yuan Suit Factory (Tianjin Shiyuan Tongchuang Technology Co., Ltd., Chengxingwang Zhigu, Baodi, Tianjin, est. 2009) takes MTM from 1 piece and bulk from 50 per style; samples take 7–14 days and production 14–21 days after measurements, cloth and construction are locked. WhatsApp +65 8013 8838.
Do all tailored jackets need front darts? No. Soft and sack styles often run clean fronts; shaped day jackets often use darts.
Can side-seam suppression replace front darts? It can for a softer waist; write which method you want rather than assuming.
Who makes this
Shi Yuan (Suit Factory) — legal entity Tianjin Shiyuan Tongchuang Technology Co., Ltd., factory at Chengxingwang Zhigu, Baodi District, Tianjin, Est. 2009. Our founder brings four decades in Chinese menswear manufacturing; founded Shi Yuan in 2009. acumenwear.com is the export domain for Shi Yuan Suit Factory. Order threads: WhatsApp +65 8013 8838 · houzhenying226@gmail.com. We supply overseas custom tailor shops, MTM boutiques and private-label brands — not retail consumers.
Shi Yuan Suit Factory is not affiliated with Tianjin Shiyuan Clothing Co., Ltd.
Next step: sample or inquiry
Send darted or undarted, suppression level and a front reference photo. Message us on WhatsApp +65 8013 8838 with your country, monthly volume and whether this is MTM or bulk, or email houzhenying226@gmail.com. We reply with the sample route and what we still need from you.
Last checked: 2026-11-07. Figures on this page were checked against Shi Yuan's own published terms (sample policy and process pages). Anything not listed here is confirmed in writing on the order thread.
