Most efficient way to do such a thing?

Let's say I have an costume, and it's in pairs(such as boots, arms, basically 2 things). I have something that checks whether it is an pairs costume item or not, but what's the most efficient way to check the 2 items, let's say I have right leggings, and left leggings, is there a way to check the both items if it contains the particular string "leggings" whilst ignoring the first string which is whether "left" or "right", but this doesn't only apply to leggings, everything that has similiar surname string, such as left "arm" and right "arm",I've been told I should use formatting aswell..?

function acquireCostume(costumeId)
	assert(costumeId, "Acquiring a nil costume!")
	
	local costumes = Resources.Models.Costumes
	local costume = costumes[costumeId]:clone()
	costume.Parent = pseudoChar
	
	if costume then
		local stats = _G.Module:LoadSpecificModule(costume, "Stats")
		local costumeCf = stats.costumeCf
		local type = stats.type
		local model = costume.Model
		
		table.insert(equippedCostumes, costumeId)
		
		for i, par in pairs(model:GetChildren()) do
			 _G.Weld:autoWeld(model.Main, par)
			local costumeWeld = _G.Weld:weld(model.Main, pseudoChar[type])
			costumeWeld.C0 = costumeCf
			if stats.pairs then
				
			end
		end

		for k, v in pairs(equippedCostumes) do -- testing purposes
   			print(v)
		end
		return costume		
	end
end

Bump, need to get this done...