A future weakening of the dollar means you should buy and store now as many non-perishable items as you can afford and know you will use for many years.
That would include clothes, furniture, hobby items, etc.
This also protects you against future increases in sales taxes and any future value added taxes.
pricing on such items can deflate due to reduced demand... which is why I’d consider gold and when the time comes, exchange gold for dollars at that time, and buy the item... negating the inflation