Synth vendor additions (#6278)

# About the pull request

Adds some synth formal wear

# Explain why it's good for the game

More customization options, pretty weird that synth didn't really have
much options in terms of formal stuff previously.

# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

Put screenshots and videos here with an empty line between the
screenshots and the `<details>` tags.

</details>


# Changelog
:cl:
add: Adds the option for synths to buy different varieties of suit
pants, suit jackets, vests, and dress gloves from their snowflake
vendor.
/:cl:

code/game/machinery/vending/vendor_types/crew/synthetic.dm

@@ -215,6 +215,9 @@ GLOBAL_LIST_INIT(cm_vending_clothing_synth_snowflake, list(
 	list("White Service Uniform", 12, /obj/item/clothing/under/colonist/white_service, null, VENDOR_ITEM_REGULAR),
 	list("Steward Clothes", 12, /obj/item/clothing/under/colonist/wy_joliet_shopsteward, null, VENDOR_ITEM_REGULAR),
 	list("Red Dress Skirt", 12, /obj/item/clothing/under/blackskirt, null, VENDOR_ITEM_REGULAR),
+	list("Blue Suit Pants", 12, /obj/item/clothing/under/liaison_suit/blue, null, VENDOR_ITEM_REGULAR),
+	list("Brown Suit Pants", 12, /obj/item/clothing/under/liaison_suit/brown, null, VENDOR_ITEM_REGULAR),
+	list("White Suit Pants", 12, /obj/item/clothing/under/liaison_suit/corporate_formal, null, VENDOR_ITEM_REGULAR),
 	list("Working Joe Uniform", 36, /obj/item/clothing/under/rank/synthetic/joe, null, VENDOR_ITEM_REGULAR),
 
 	list("GLASSES", 0, null, null, null),
@@ -258,6 +261,7 @@ GLOBAL_LIST_INIT(cm_vending_clothing_synth_snowflake, list(
 	list("Req Cap", 12, /obj/item/clothing/head/cmcap/req, null, VENDOR_ITEM_REGULAR),
 	list("Officer Cap", 12, /obj/item/clothing/head/cmcap/bridge, null, VENDOR_ITEM_REGULAR),
 	list("Bio Hood", 12, /obj/item/clothing/head/bio_hood/synth, null, VENDOR_ITEM_REGULAR),
+	list("Fedora", 12, /obj/item/clothing/head/fedora, null, VENDOR_ITEM_REGULAR),
 
 	list("HELMET", 0, null, null, null),
 	list("Marine Helmet (Mission-Specific Camo)", 12, /obj/item/clothing/head/helmet/marine, null, VENDOR_ITEM_REGULAR),
@@ -290,6 +294,12 @@ GLOBAL_LIST_INIT(cm_vending_clothing_synth_snowflake, list(
 	list("Labcoat, Researcher", 12, /obj/item/clothing/suit/storage/labcoat/researcher, null, VENDOR_ITEM_REGULAR),
 	list("Quartermaster Jacket", 12, /obj/item/clothing/suit/storage/RO, null, VENDOR_ITEM_REGULAR),
 	list("Bio Suit", 12, /obj/item/clothing/suit/storage/synthbio, null, VENDOR_ITEM_REGULAR),
+	list("Black Suit Jacket", 12, /obj/item/clothing/suit/storage/jacket/marine/corporate/black, null, VENDOR_ITEM_REGULAR),
+	list("Brown Suit Jacket", 12, /obj/item/clothing/suit/storage/jacket/marine/corporate/brown, null, VENDOR_ITEM_REGULAR),
+	list("Blue Suit Jacket", 12, /obj/item/clothing/suit/storage/jacket/marine/corporate/blue, null, VENDOR_ITEM_REGULAR),
+	list("Brown Vest", 12, /obj/item/clothing/suit/storage/jacket/marine/vest, null, VENDOR_ITEM_REGULAR),
+	list("Tan Vest", 12, /obj/item/clothing/suit/storage/jacket/marine/vest/tan, null, VENDOR_ITEM_REGULAR),
+	list("Grey Vest", 12, /obj/item/clothing/suit/storage/jacket/marine/vest/grey, null, VENDOR_ITEM_REGULAR),
 	list("USCM Poncho (Mission-Specific Camo)", 12, /obj/item/clothing/accessory/poncho, null, VENDOR_ITEM_REGULAR),
 	list("USCM Poncho (Green)", 12, /obj/item/clothing/accessory/poncho/green, null, VENDOR_ITEM_REGULAR),
 	list("USCM Poncho (Brown)", 12, /obj/item/clothing/accessory/poncho/brown, null, VENDOR_ITEM_REGULAR),
@@ -315,6 +325,7 @@ GLOBAL_LIST_INIT(cm_vending_clothing_synth_snowflake, list(
 	list("Purple Armband", 6, /obj/item/clothing/accessory/armband/science, null, VENDOR_ITEM_REGULAR),
 	list("Yellow Armband", 6, /obj/item/clothing/accessory/armband/engine, null, VENDOR_ITEM_REGULAR),
 	list("Green Armband", 6, /obj/item/clothing/accessory/armband/medgreen, null, VENDOR_ITEM_REGULAR),
+	list("Dress Gloves", 6, /obj/item/clothing/gloves/marine/dress, null, VENDOR_ITEM_REGULAR),
 
 ))