You can run around to merchants to get replacement equipment (inventories reset after 10 or 15 minutes real time, depending on the merchant).
DAD's item editor would let you make reasonable replicas of your previous equipment.
If you need gold to replace your equipment, you can get an unlimited supply...
Drag a stack (potions, gold, etc) out of (or into) your inventory (or container) and hold down the control key before dropping. This will bring up the split stack pane; type in a negative number and hit enter (the checkmark will be greyed out). This can also be done in the trade window.
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