Simple. On the front of the form write "$350".
On the back write:
Clothes -- $300
Misc Gifts -- $50
Total -- $350
You don't have to list each item-- just each group or category.
How far can you go in grouping things? For the above, how about
:
Things: $350
It may sound sarcastic, but I'm serious in a theoretical way. Once items are not individually listed, how can they be grouped?