diff --git a/graphql-day/booth.md b/graphql-day/booth.md
index 40d1b0f..838e3ae 100644
--- a/graphql-day/booth.md
+++ b/graphql-day/booth.md
@@ -14,7 +14,9 @@ ambassador tasks.
 
 ## Staffing the booth
 
-- Wear the pink t-shirt.
+- Wear the pink t-shirt
+  ([a pink t-shirt](https://graphql-foundation-shop.fourthwall.com/products/ask-me-about-graphql)
+  if you don't have one already).
 - Do not stand in a circle facing inwards. Stand in a horseshoe or a line, so
   people feel welcome to join.
 - Always have 2 people on the booth, in case one person needs a break.