Tiger Stripe RVD.
Black Razor Ramon with yellow vest.
Virgil in any wrestling attire.
Kona Crush.
Evil Crush.
Repo Man.
Sid Justice with royal blue trunks.
Sycho Sid with red trunks.
Heel Tatanka.
Debut tights Tatanka.
Agree with most suggestions too.
Agree with all of these.
I would also add:
Razor Ramon - pale blue tights from RR94, or SSL94 attire, or the black and gold attire from IYH vs Vader, or the green attire he wore when he won the IC title for the first time
Bret Hart - singlet gear from Survivor Series 93, WM8 attire, Survivor Series 95 attire
Tito Santana - Matador Tights
Rick Martel - Strike Force gear, pale blue tights, pink tights
One Mang Gang - prototype that was shown years ago
Barbarian - singles attire
Powers of Pain - Survivor Series 89 team photo attire
Bob Holly - Sparky Plugg attire, Hardcore Holly attire
Brutus Beefcake - Summer Slam 1989 and Royal Rumble 1990 attire
Iron Sheik - Col. Mustafa attire
Dusty Rhodes - Survivor Series 90 team photo attire
Dustin Rhodes - any WCW attire of his as the Natural
Earthquake - Canadian Earthquake attire RR90
Harley Race - NWA attire, preferably the Red, White and Blue attire
Honky Tonk Man - white jumpsuit, blue/green jumpsuit. Black and blue trunks, black and gold trunks
Jake the Snake - blue flame tights
Jim Neidhart - New Foundation/Singles Run attire
Jimmy Snuka - traditional leopard trunks, or the white leopard trunks he wore at Summer Slam 1989
Koko B Ware - WrestleMania 6 attire or Survivor Series 90 attire
Lex Luger - early 90s WCW attire, preferably the light blue or yellow trunks, also his 1995/96 WCW attire of black trunks and white boots
Marty Jannetty - 1993 singles attire (Raw on May of 1993) and his 1995/96 singles attire (either Survivor Series 1995 or Royal Rumble 1996)
Jacques Rougeau - the Mountie
Mr. Perfect - Survivor Series 1989, KOTR 1993, or Summer Slam 1993
Mr. Fuji - in a Tux or with a robe
Macho Man - SNME 1988, WM5, SSL89, WM6, SSL90, SNME90 vs Dusty Rhodes, SNME90 attacks Ultimate Warrior, Lifestyles of the Rich and Famous attire, WWF Superstars 1991 saves Hulk Hogan, SSL92
Ric Flair - SNME 1992 Red and Black attire, WCW Unification Match vs Sting Yellow and Black attire, Green Tights with yellow boots attire from WCW in 1995/96
Rick Rude - Grim Reaper Tights from 1989, RR90 "Ravishing" tights, WM6 green jungle tights, any WCW attire
Ricky Steamboat - Any WCW attire from 1991-1994
Roddy Piper - 1984/85 heel Piper with either the white panther shirt or the red Piper's Pit shirt
Ron Simmons - another WCW attire, maybe the purple and gold attire he wore when he beat Vader for the WCW title, Doom attire, and that weird gladiator stuff he wore when he debut in the WWF
Ron Garvin - RR90 attire to go with the Greg Valentine figure
123 Kid - the black/white/and red from 1994, or the purple/white/and red from 1995/96
Sgt. Slaughter - entrance gear from WM7 or SSL91
Shawn Michaels - Survivor Series 92, IYH 1995 vs Jeff Jarrett, IYH 1996 vs Diesel, RR96, Survivor Series 96, KOTR 97
Sid - SNME 1992 red and black attire, I also wouldn't mind the basic we got of him in his RR92 attire to be made as an elite
Sting - so many surfer Sting attires they still haven't done
Texas Tornado - Summer Slam 1990
The Brain Busters - Summer Slam 1989
The Bushwhackers - grey tank tops
The Fabulous Rougeau Brothers - heel shorts attire
The Headshrinkers - KOTR94
Legion of Doom - WM7, SSL92, LOD2000
The Mega Powers - Summer Slam 1988
Money Inc - WM9
The Nasty Boys - WCW attire
Rhythm and Blues - SNME 90 attires or Survivor Series 1990 attires
The Rockers - Survivor Series 1991, WM6, RR91
Ultimate Warrior - WM12, IYH 1996 vs Goldust, KOTR96, Raw 96 vs Vader (orange attire), SSL91, SNME90 vs Ted DiBiase, SNME91 vs SGT Slaughter, WM6 poster with the Yellow IC Title Strap
Virgil - WM7, SSL91 or WM8