Adds grey jeans, jeans shorts, and jeans shorts (female). Kinda annoyed we have so many variants but that's for another day.

The grey jeans are the black jeans sprite (which are grey...)
The black jeans are now darker! But they still look different from black pants.
The black shorts have had their side-sprites darkened so they look black, not grey, and match the front/back view better.
The new grey variants keep those grey sides and have grey back and fronts too.

code/modules/client/preference_setup/loadout/loadout_uniform.dm

@@ -271,6 +271,10 @@
 	display_name = "pants, black jeans"
 	path = /obj/item/clothing/under/pants/blackjeans
 
+/datum/gear/uniform/pants/jeans/grey
+	display_name = "pants, grey jeans"
+	path = /obj/item/clothing/under/pants/greyjeans
+
 /datum/gear/uniform/pants/jeans/youngfolks
 	display_name = "pants, young folks jeans"
 	path = /obj/item/clothing/under/pants/youngfolksjeans
@@ -295,6 +299,10 @@
 	display_name = "shorts, black jeans"
 	path = /obj/item/clothing/under/shorts/jeans/black
 
+/datum/gear/uniform/jeans/grey
+	display_name = "shorts, grey jeans"
+	path = /obj/item/clothing/under/shorts/jeans/grey
+
 /datum/gear/uniform/jeans/female
 	display_name = "shorts, female, jeans"
 	path = /obj/item/clothing/under/shorts/jeans/female
@@ -315,6 +323,10 @@
 	display_name = "shorts, female, black jeans"
 	path = /obj/item/clothing/under/shorts/jeans/black/female
 
+/datum/gear/uniform/jeans/grey/female
+	display_name = "shorts, female, grey jeans"
+	path = /obj/item/clothing/under/shorts/jeans/grey/female
+
 /datum/gear/uniform/khaki
 	display_name = "shorts, khaki"
 	path = /obj/item/clothing/under/shorts/khaki

code/modules/clothing/under/pants.dm

@@ -17,6 +17,11 @@
 	desc = "Only for those who can pull it off."
 	icon_state = "jeansblack"
 
+/obj/item/clothing/under/pants/greyjeans
+	name = "grey jeans"
+	desc = "Only for those who can pull it off."
+	icon_state = "jeansgrey"
+
 /obj/item/clothing/under/pants/youngfolksjeans
 	name = "Young Folks jeans"
 	desc = "For those tired of boring old jeans. Relive the passion of your youth!"

code/modules/clothing/under/shorts.dm

@@ -75,6 +75,15 @@
 	icon_state = "black_shorts_f"
 	worn_state = "black_shorts_f"
 
+/obj/item/clothing/under/shorts/jeans/grey
+	name = "grey jeans shorts"
+	icon_state = "greypants_shorts"
+	worn_state = "greypants_shorts"
+
+/obj/item/clothing/under/shorts/jeans/grey/female
+	icon_state = "grey_shorts_f"
+	worn_state = "grey_shorts_f"
+
 /obj/item/clothing/under/shorts/khaki
 	name = "khaki shorts"
 	desc = "For that island getaway. It's five o'clock somewhere, right?"