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"Flat Six Society" T-Shirt | "Precision Blueprint" Porsche Flat-Six Engine Schematic Technical Drawing Lifestyle Tee
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Size chart
All purchases are final sale. Exchanges/refunds will not be given for buyer error or remorse. Below, we show you how to measure yourself and the sizes based on apparel type. Pro tip! Measure one of your similar items at home and compare it with the measurements you see in this guide.
Product measurements may vary by up to 2" (5 cm).

Unisex T-shirts |
Length (in-cm) | Width (in-cm) |
|
Small |
28 - 71.1 | 18 - 45.7 |
|
Medium |
29 - 73.7 | 20 - 50.8 |
|
Large |
30 - 76.2 | 22 - 55.9 |
|
X Large |
31 - 78.7 | 24 - 61 |
|
2X Large |
32 - 81.3 | 26 - 66 |
|
3X Large |
33 - 83.8 | 28 - 71.1 |
Button-Up Shirts |
Width (in) | Length (in) | Sleeve (in) |
| 2XS | 20 ½ | 30 ⅛ | 10 ¼ |
| XS | 21 ¼ | 30 ½ | 10 ¼ |
| Small | 22 | 30 ⅞ | 10 ¼ |
| Medium | 22 ¾ | 31 ¼ | 10 ¼ |
| Large | 24 ⅜ | 32 ⅛ | 10 ⅜ |
| XL | 26 | 32 ⅞ | 10 ⅝ |
| 2XL | 27 ⅝ | 33 ¾ | 10 ¾ |
| 3XL | 29 ⅛ | 35 | 11 |
| 4XL | 30 ¾ | 35 ¾ | 11 ¼ |
| 5XL | 32 ¼ | 36 ⅝ | 11 ⅜ |
| 6XL | 33 ⅞ | 37 ⅜ | 11 ⅝ |
| Polo Shirts (Slim Fit) | Length (in) | Chest width (in) |
| XS | 27 ¾ | 19 |
| S | 28 ¼ | 19 ¾ |
| M | 28 ½ | 20 ½ |
| L | 29 | 21 ¼ |
| XL | 29 ¼ | 22 |
| 2XL | 29 ¾ | 22 ¾ |
| 3XL | 30 ¼ | 23 ½ |
Hoodies |
Length (in) | Width (in) |
| Small | 27 | 20 |
| Medium | 28 | 21 |
| Large | 29 | 23 |
| XL | 30 | 25 |
| 2XL | 31 | 26 1/2 |
| 3XL | 32 | 28 |
Raglan shirts |
Length (in) | Width (in) |
| XS | 26 | 16 ½ |
| Small | 28 | 18 |
| Medium | 29 | 20 |
| Large | 30 | 22 |
| XL | 31 | 24 |
| 2XL | 32 | 26 |
Women's T-Shirts |
SHIRT WIDTH | SHIRT LENGTH | US SIZES | EU SIZE | UK SIZE |
| Small | 18.5 | 25.25 | 6-8 | 36-38 | 10-12 |
| Medium | 20 | 26 | 10-12 | 40-42 | 14-16 |
| Large | 22 | 26.75 | 14-16 | 44-46 | 18-20 |
| XL | 24 | 27.5 | 18-20 | 48-50 | 22-24 |
| 2XL | 26 | 28.25 | 22-24 | 52-54 | 26-28 |
| 3XL | 28 | 29 | 26-28 | 56-58 | 30-32 |
"Flat Six Society" T-Shirt | "Precision Blueprint" Porsche Flat-Six Engine Schematic Technical Drawing Lifestyle Tee | Gift for Porsche Fans & Engineering Enthusiasts
Flat Six Society. Precision blueprint. The Porsche flat-six wasn't designed — it was engineered. Every dimension calculated, every component machined to exacting tolerances, every detail refined across six decades of continuous development. The technical blueprint reveals the level of precision engineering that built the legend. Members of the Flat Six Society know exactly what they're looking at.
Perfect for Porsche flat-six engineering enthusiasts, 911 owners across every generation, technical blueprint and engineering drawing fans, mechanical engineering history nerds, vintage Porsche restorers, Porsche Club of America members, Rennsport Reunion attendees, Cars & Coffee veterans, and anyone who knows the flat-six is one of the most precisely engineered engines ever produced. A perfect gift for the friend whose dream garage poster has been a flat-six blueprint for years.
- 100% combed and ring-spun cotton (Heather colors contain polyester)
- Fabric weight: 4.2 oz/yd² (142 g/m²)
- Pre-shrunk fabric
- Side-seamed construction
- Shoulder-to-shoulder taping
- Blank product sourced from Guatemala, Nicaragua, Mexico, Honduras, or the US
Size guide
| LENGTH (inches) | WIDTH (inches) | CHEST (inches) | |
| S | 28 | 18 | 34-37 |
| M | 29 | 20 | 38-41 |
| L | 30 | 22 | 42-45 |
| XL | 31 | 24 | 46-49 |
| 2XL | 32 | 26 | 50-53 |
| 3XL | 33 | 28 | 54-57 |
| LENGTH (cm) | WIDTH (cm) | CHEST (cm) | |
| S | 71.1 | 45.7 | 86.4-94 |
| M | 73.7 | 50.8 | 96.5-104.1 |
| L | 76.2 | 55.9 | 106.7-114.3 |
| XL | 78.7 | 61 | 116.8-124.5 |
| 2XL | 81.3 | 66 | 127-134.6 |
| 3XL | 83.8 | 71.1 | 137.2-144.8 |
All sales are final unless the item is defective, damaged, or the wrong one was sent.
It is very important you order the right size - exchanges/refunds will not be given for buyer error or remorse. Read more here.
Adding product to your cart
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
This website is encrypted. We take your security very seriously. All transactions powered by Shopify.
Rates are approximations. Exact rates will be provided at checkout.
Shipping estimator











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