diff -ur vanilla/src/do_wear.c oilskin-coif/src/do_wear.c
--- vanilla/src/do_wear.c	2003-12-08 00:39:13.000000000 +0100
+++ oilskin-coif/src/do_wear.c	2008-04-25 20:59:16.000000000 +0200
@@ -341,6 +341,9 @@
 		    makeknown(HELM_OF_OPPOSITE_ALIGNMENT);
 		}
 		break;
+	case OILSKIN_COIF:
+		pline("%s very tightly.", Tobjnam(uarmh, "fit"));
+		break;
 	default: impossible(unknown_type, c_helmet, uarmh->otyp);
     }
     return 0;
@@ -358,6 +361,7 @@
 	case ELVEN_LEATHER_HELM:
 	case DWARVISH_IRON_HELM:
 	case ORCISH_HELM:
+	case OILSKIN_COIF:
 	    break;
 	case DUNCE_CAP:
 	    flags.botl = 1;
diff -ur vanilla/src/mhitu.c oilskin-coif/src/mhitu.c
--- vanilla/src/mhitu.c	2003-12-08 00:39:13.000000000 +0100
+++ oilskin-coif/src/mhitu.c	2008-04-21 15:25:44.000000000 +0200
@@ -791,17 +791,18 @@
 
 	/* if your cloak/armor is greased, monster slips off; this
 	   protection might fail (33% chance) when the armor is cursed */
-	if (obj && (obj->greased || obj->otyp == OILSKIN_CLOAK) &&
+	if (obj && (obj->greased || obj->otyp == OILSKIN_CLOAK ||
+                    obj->otyp == OILSKIN_COIF) &&
 		(!obj->cursed || rn2(3))) {
-	    pline("%s %s your %s %s!",
+	    pline("%s %s your %s%s!",
 		  Monnam(mtmp),
 		  (mattk->adtyp == AD_WRAP) ?
 			"slips off of" : "grabs you, but cannot hold onto",
-		  obj->greased ? "greased" : "slippery",
-		  /* avoid "slippery slippery cloak"
-		     for undiscovered oilskin cloak */
-		  (obj->greased || objects[obj->otyp].oc_name_known) ?
-			xname(obj) : cloak_simple_name(obj));
+		  obj->greased ? "greased " :
+                  /* avoid "slippery slippery"
+                     for undiscovered oilskin cloak/coif */
+                  objects[obj->otyp].oc_name_known ? "slippery " : "",
+                  xname(obj));
 
 	    if (obj->greased && !rn2(2)) {
 		pline_The("grease wears off.");
diff -ur vanilla/src/objects.c oilskin-coif/src/objects.c
--- vanilla/src/objects.c	2003-12-08 00:39:13.000000000 +0100
+++ oilskin-coif/src/objects.c	2008-04-21 15:15:27.000000000 +0200
@@ -294,11 +294,13 @@
 
 /* helmets */
 HELM("elven leather helm", "leather hat",
-		0, 0,  0,	6, 1,  3,   8, 9, 0, LEATHER, HI_LEATHER),
+		0, 0,  0,	5, 1,  3,   8, 9, 0, LEATHER, HI_LEATHER),
 HELM("orcish helm", "iron skull cap",
-		0, 0,  0,	6, 1, 30,  10, 9, 0, IRON, CLR_BLACK),
+		0, 0,  0,	5, 1, 30,  10, 9, 0, IRON, CLR_BLACK),
 HELM("dwarvish iron helm", "hard hat",
-		0, 0,  0,	6, 1, 40,  20, 8, 0, IRON, HI_METAL),
+		0, 0,  0,	5, 1, 40,  20, 8, 0, IRON, HI_METAL),
+HELM("oilskin coif", "slippery coif",
+		0, 0,  0,	5, 1,  5,  50, 9, 0, CLOTH, HI_CLOTH),
 HELM("fedora", (char *)0,
 		1, 0,  0,	0, 0,  3,   1,10, 0, CLOTH, CLR_BROWN),
 HELM("cornuthaum", "conical hat",
@@ -312,9 +314,9 @@
 HELM("helmet", "plumed helmet",
 		0, 0,  0,      10, 1, 30,  10, 9, 0, IRON, HI_METAL),
 HELM("helm of brilliance", "etched helmet",
-		0, 1,  0,	6, 1, 50,  50, 9, 0, IRON, CLR_GREEN),
+		0, 1,  0,	5, 1, 50,  50, 9, 0, IRON, CLR_GREEN),
 HELM("helm of opposite alignment", "crested helmet",
-		0, 1,  0,	6, 1, 50,  50, 9, 0, IRON, HI_METAL),
+		0, 1,  0,	5, 1, 50,  50, 9, 0, IRON, HI_METAL),
 HELM("helm of telepathy", "visored helmet",
 		0, 1,  TELEPAT, 2, 1, 50,  50, 9, 0, IRON, HI_METAL),