diff --git a/routes/conversation.py b/routes/conversation.py
index 4621cde..a9a1680 100644
--- a/routes/conversation.py
+++ b/routes/conversation.py
@@ -1740,6 +1740,7 @@ _PERIOD_WORDING = (
     (r"jacken?\b|jacket\w*", "wool tunic"),
     (r"westen?\b|waistcoat\w*|vest\b", "sleeveless leather jerkin"),
     (r"schals?\b|scarf|scarves", "wool neck-wrap"),
+    (r"dreispitz\w*|dreimaster|tricorn\w*|dreieckshut|three-cornered hat", "plain iron helm"),
     (r"h[üu]te?\b(?!\w)|\bhats?\b", "soft wool hood"),
     (r"sporen|spurs?", "stitched leather boots"),
     (r"hosen?\b|trousers|pants", "wool leggings"),
diff --git a/tests/test_character_identity.py b/tests/test_character_identity.py
index 3b91039..67197c8 100644
--- a/tests/test_character_identity.py
+++ b/tests/test_character_identity.py
@@ -189,6 +189,9 @@ class PromptHygieneTests(unittest.TestCase):
         self.assertNotIn("blut", text.lower())
         self.assertNotIn("verbunden", text.lower())
 
+    def test_a_tricorn_hat_becomes_a_helm(self):
+        self.assertNotIn("dreispitz", self.facts(clothing="Rüstung mit Dreispitz").lower())
+
     def test_soot_and_dirt_are_not_painted_on(self):
         text = self.facts(physical="Wallendes Haar, rußverschmierte Backen.")
         self.assertIn("Wallendes Haar", text)