Sinsa Station made-to-measure suit, Jeil Mojik fabric: JJ Republic
In short
JJ Republic Sinsa Main Store is a made-to-measure suit shop on Gangnam-daero 152-gil, near Sinsa Station Exit 8 in Gangnam, Seoul. The consultation at JJ Republic compared Jeil Mojik poly20/wool80 against British and Italian cloth before settling on Jeil Mojik 'buonabito', then covered shoulder, back and arm measurements and shirt collar, cuff and button choices, followed by a look around the brand's own factory where cutting and sewing are done in-house. At 399,000 won for a jacket-and-trousers set, the consultation was unusually thorough.
Good to know
- Name
- JJ Republic Sinsa Main Store
- Address
- 2nd floor, 13 Gangnam-daero 152-gil, Gangnam-gu, Seoul
- Hours
- Daily 11:00–20:00
- Price
- Jacket + trousers set 399,000 won / +30,000 won for stretch fabric
- Fabric chosen
- Jeil Mojik 'buonabito' (poly 20 / wool 80)
- Parking
- Valet in front of Cheonmimi Chinese restaurant (1 hour free); when valet is unavailable during the 2–5pm lunch period, you can park in an open space
- Location
- A short walk from Sinsa Station Exit 8
- Price reference
- ₩399,000 ≈ $296 · ₩30,000 ≈ $22.5 (2026-09-15)
as written by the visitor on Sep 14, 2026
I figured it was time to get a proper suit made, so I visited JJ Republic Sinsa Main Store, well known for custom suits in Gangnam. I'd heard they make everything from formalwear to everyday suits, and the consultation was far more thorough than I expected — a satisfying day overall.
Where is JJ Republic Sinsa Main Store, and where do you park?
JJ Republic Sinsa Main Store is located at 13 Gangnam-daero 152-gil, 2nd floor, Gangnam-gu, Seoul, not far from Sinsa Station Exit 8. It's open daily from 11:00 to 20:00, and valet parking is available in front of Cheonmimi Chinese Restaurant (1 hour free). During lunch hours from 2 to 5pm, if valet isn't available, you can park in any open space.
Since parking is available, driving is fine, but given how close it is to the station, public transit is a good option too. Hours and closed days can vary slightly, so it's worth checking before you visit.
What the JJ Republic storefront and interior look like
🧵 Racks of suits from the entrance onward
Right as I walked in, rows of suit jackets caught my eye. From basic black, navy and gray to check patterns, there was plenty of variety, which made it fun to browse for something that matched my taste.
How does the fabric consultation work at JJ Republic?
📐 Comparing Jeil Mojik, British and Italian fabrics
At JJ Republic Sinsa Main Store, they showed me the differences between Korean Jeil Mojik poly20/wool80 fabric, British fabric, and Italian fabric. I knew nothing about fabric going in, but they explained everything piece by piece, so I learned a lot.
Personally, I liked the matte, non-shiny feel of the British fabric more, but this time I went with Jeil Mojik's 'buonabito' fabric, which is a good everyday basic.
It keeps a luxurious look with just enough sheen, and since it's 20% poly, it's relatively more resistant to wear from friction — hearing that explanation made it feel like a practical choice.
Measurements, fit adjustments and shirt details
📏 Shoulder, back and arm measurements at JJ Republic
Since it's a custom suit, they measured everything really carefully — shoulder width, back, arm length, and points specific to my build, adjusting each one by one.
They kept asking for my opinion along the way, so it never felt one-sided, which I appreciated.
I could also choose the shirt collar and cuff details, and the button style, one by one — there was a lot of room to tailor things to my taste.
Cutting and sewing at the JJ Republic in-house factory
🏭 Inside the brand's own production factory
What impressed me was that JJ Republic Sinsa Main Store runs its own production line, not just a storefront — an in-house factory. Rather than outsourcing production, they cut and sew everything themselves.
On the factory worktables, cut fabric pieces were stacked layer upon layer, and I watched craftspeople aligning the boundary between the lining and outer fabric by hand, pressing it almost like ironing.
Realizing that every one of these steps affects the fit made it clear why a custom suit is so different from ready-made clothing.
I also watched someone at a sewing machine stitching lining tape labeled JJ REPUBLIC onto the inside of a jacket. Seeing the brand label sewn on by hand made it clear this is a very different process from mass production.
At another worktable, someone was cutting navy-toned lining fabric, trimming even a single stray thread with scissors — the attention to detail was remarkable. Watching them carefully cut along chalk lines on the outer fabric, I really felt how much handwork goes into a single suit.
Price and verdict: 399,000 won for a suit set
JJ Republic Sinsa Main Store charges ₩399,000 for a jacket-and-trousers set, and choosing a spandex-blend fabric adds another ₩30,000 — worth keeping in mind. I'd looked into several custom suit shops, and it's rare to find one at this price point that gives such a thorough consultation and shapes the fit this nicely.
Above all, seeing the cutting and sewing done in-house at their own factory really boosted my trust in them. Since they handle everything from formalwear to everyday suits, anyone looking into custom suits in Gangnam might want to check this place out.
- Name: JJ Republic Sinsa Main Store
- Address: 13 Gangnam-daero 152-gil, 2nd floor, Gangnam-gu, Seoul, South Korea
- Hours: Daily 11:00–20:00
- Parking: Valet available in front of Cheonmimi Chinese Restaurant (1 hour free); if valet unavailable during lunch 2–5pm, park in any open space
Where it is
13 Gangnam-daero 152-gil, 2nd floor, Gangnam-gu, Seoul, South Korea서울특별시 강남구 강남대로152길 13 2층
