diff --git a/changelog.txt b/changelog.txt
index e3eaaf0f7..1d8780ede 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -27,6 +27,7 @@ Template for new versions:
 # Future
 
 ## New Tools
+- `resize-armor`: resize armor or clothing item to any creature size.
 
 ## New Features
 
diff --git a/docs/resize-armor.rst b/docs/resize-armor.rst
new file mode 100644
index 000000000..1ea1e0c09
--- /dev/null
+++ b/docs/resize-armor.rst
@@ -0,0 +1,26 @@
+resize-armor
+============
+
+.. dfhack-tool::
+    :summary: Resize armor and clothing.
+    :tags: adventure fort armok gameplay items
+
+Resize any armor or clothing item to suit any creature size.
+
+Usage
+-----
+
+``resize-armor [<option>]``
+
+Select an armor or clothing item while in either adventure or fortress mode and
+run this tool to resize the item. A stockpile can be selected while in fortress
+mode to perform the resize operation on armor or clothing items contained in
+the stockpile. If race ID is not specified, the items will be resized to suit
+the race of the current adventurer while in adventure mode, or to suit the race
+of the current site's civilization while in fortress mode.
+
+Options
+-------
+
+``-r``, ``--race <id>``
+    Specify the race ID of the target race to resize the item to.
diff --git a/resize-armor.lua b/resize-armor.lua
new file mode 100644
index 000000000..1735520c9
--- /dev/null
+++ b/resize-armor.lua
@@ -0,0 +1,150 @@
+-- Resize armor and clothing.
+
+local argparse = require('argparse')
+local utils = require('utils')
+
+local function isValidItem(item)
+    local itemTypes = {
+        df.item_type.ARMOR,
+        df.item_type.SHOES,
+        df.item_type.GLOVES,
+        df.item_type.HELM,
+        df.item_type.PANTS,
+    }
+    if not utils.linear_index(itemTypes, item:getType()) or
+        item.flags.in_job or
+        item.flags.hostile or
+        item.flags.removed or
+        item.flags.dead_dwarf or
+        item.flags.rotten or
+        item.flags.spider_web or
+        item.flags.construction or
+        item.flags.encased or
+        item.flags.trader or
+        item.flags.garbage_collect or
+        item.flags.forbid or
+        item.flags.dump or
+        item.flags.on_fire or
+        item.flags.melt
+    then
+        return false
+    end
+    return true
+end
+
+local function GetstockpileItems(stockpile)
+    local stockpileItems = dfhack.buildings.getStockpileContents(stockpile)
+    local items = {}
+    for _, stockpileItem in ipairs(stockpileItems) do
+        local containedItems = {}
+        for _, generalRef in ipairs(stockpileItem.general_refs) do
+            if df.general_ref_contains_itemst:is_instance(generalRef) then
+                containedItems = dfhack.items.getContainedItems(stockpileItem)
+            end
+        end
+        if #containedItems > 0 then
+            for _, containedItem in ipairs(containedItems) do
+                if isValidItem(containedItem) then
+                    table.insert(items, containedItem)
+                end
+            end
+        end
+        if #stockpileItems > 0 and isValidItem(stockpileItem) then
+            table.insert(items, stockpileItem)
+        end
+    end
+    return items
+end
+
+local function GetRace()
+    local race
+    if dfhack.world.isAdventureMode() then
+        race = dfhack.world.getAdventurer().race
+    elseif dfhack.world.isFortressMode() then
+        local site = dfhack.world.getCurrentSite()
+        for _, entityLink in ipairs(site.entity_links) do
+            local entity = df.historical_entity.find(entityLink.entity_id)
+            if entity and entity.type == df.historical_entity_type.Civilization then
+                race = entity.race
+                break
+            end
+        end
+    end
+    return race
+end
+
+local function ResizeItems(items, race)
+    local raceName = race and dfhack.units.getRaceNamePluralById(race)
+    local resizeCount = 0
+    for _, item in ipairs(items) do
+        local itemName = item and dfhack.items.getReadableDescription(item)
+        if item:getMakerRace() ~= race then
+            item:setMakerRace(race)
+            item:calculateWeight()
+            resizeCount = resizeCount + 1
+            if #items == 1 then print(('%s resized for %s.'):format(itemName, raceName)) end
+        elseif #items == 1 then print(('%s is already sized for %s.'):format(itemName, raceName)) end
+    end
+    if resizeCount > 1 then
+        print(('%d items resized for %s.'):format(resizeCount, raceName))
+    elseif resizeCount == 0 and #items > 1 then
+        print(('All items are already sized for %s'):format(raceName))
+    end
+end
+
+local function ParseCommandLine(args)
+    local options = {
+        help = false,
+        race = nil,
+    }
+    local positionals = argparse.processArgsGetopt(args, {
+        {'h', 'help', handler = function() options.help = true end},
+        {'r', 'race', hasArg = true, handler = function(arg) options.race = argparse.nonnegativeInt(arg, 'race') end},
+    })
+    return options
+end
+
+local function Main(args)
+    local options = ParseCommandLine(args)
+    if args[1] == 'help' or options.help then
+        print(dfhack.script_help())
+        return
+    end
+    local items = {}
+    local item = dfhack.gui.getSelectedItem(true)
+    if item then
+        if isValidItem(item) then
+            table.insert(items, item)
+        else
+            qerror('Selected item cannot be resized.')
+        end
+    elseif dfhack.world.isFortressMode() then
+        local stockpile = dfhack.gui.getSelectedStockpile(true)
+        if stockpile and df.building_stockpilest:is_instance(stockpile) then
+            items = GetstockpileItems(stockpile)
+            if #items < 1 then qerror('Selected stockpile contains no items that can be resized.') end
+        end
+    end
+    if #items > 0 then
+        local race = options.race or GetRace()
+        if not race then
+            qerror('Unable to obtain race ID. Please specify race ID manually.')
+        end
+        ResizeItems(items, race)
+    else
+        if dfhack.world.isAdventureMode() then
+            qerror('No item selected.')
+        elseif dfhack.world.isFortressMode() then
+            qerror('No item or stockpile selected.')
+        end
+    end
+end
+
+if not dfhack.isMapLoaded() or (
+        not dfhack.world.isAdventureMode() and not dfhack.world.isFortressMode()
+    )
+then
+    qerror('This script requires the game to be in adventure or fortress mode.')
+end
+
+Main({...})