Step-by-Step Guide
Step 1: Gather Your Tools
You need a soft measuring tape (tailor's tape), a flat surface, and a t-shirt that fits you well as a reference. If you don't have a tape, use a string and then measure it against a ruler. Write down your measurements in inches or centimeters - the chart below uses both.
Step 2: Measure Your Chest
Wrap the tape around the fullest part of your chest, just under your armpits. Keep the tape parallel to the floor and snug but not tight. Breathe normally. This is your chest circumference. For a relaxed fit, add 2 - 4 inches to this number when comparing to the size chart.
Pro tip: Measure with the t-shirt you plan to wear underneath. If you'll layer over a hoodie, account for that extra bulk.
Step 3: Measure Your Length
From the highest point of your shoulder (where the collar seam would be) down to where you want the shirt to end. For most people, that's around the hip bone or just below the belt. Stand straight and let the tape fall naturally. Do this twice to ensure accuracy.
Step 4: Compare with the Size Chart
Below is the standard size chart for Darknet Diaries tees. Note that this is for unisex styles. Fitted cuts will have slightly different numbers.
| Size | Chest (inches) | Length (inches) |
| S | 34-36 | 27 |
| M | 38-40 | 28 |
| L | 42-44 | 29 |
| XL | 46-48 | 30 |
| 2XL | 50-52 | 31 |
For fitted tees (like the Shell Script Tee), go one size up from your unisex size unless you want a very snug look. The chest runs about 2 inches smaller.
Step 5: Check the Fabric
Darknet Diaries tees are 100% combed ring-spun cotton (unisex) or a tri-blend (fitted). Cotton shrinks about 3 - 5% in the first wash. If you're between sizes, size up - especially for the unisex tee. The tri-blend shrinks less but still a little.
Step 6: Read Customer Reviews
In the store, each product page has size feedback. I've noticed that most buyers for the Darknet Diaries Logo Tee say it fits true to size. For the fitted Shell Script Tee, many recommend sizing up if you have broad shoulders.
Step 7: When in Doubt, Order Two Sizes
Print-on-demand means each shirt is made to order. If you're unsure between M and L, order both and return the one that doesn't work. Check the store's return policy - but in my experience, exchanges are easy.