Don't forget to add in cost of Thread - How many Spools do you have ? ( almost $3.00 each ?) How about the Scissors and Rotary Cutters and other Supplies... Keep the Receipts when you buy them, +Take photos when you buy items for your Stash of Supplies. and keep them together as Proof of the costs.... you would be surprised as to the $$$$ amount over a year's time.. and keep them in a Safe place...
Side note: a package of Undies is $9.00+ if not on sale
... so yes if you want to keep accurate Amounts -
Keep receipts and photos..for Replacement Value..