People in humanitarian work have their own lingo, like all professions, which inevitably gets turned into acronyms. One of those is "NFIs" which stands for 'Non-Food Items." Normal people will know of calls for donating clothes, blankets, and other goods when there are humanitarian emergencies.
When you hear charities suggest that it is better to send cash instead of donating old clothes, the reason for this is because the complexities and costs of sending the items, cataloguing them, and then storing them before distribution can be more complex and more expensive than buying them new in bulk from suppliers.
This is the R4R warehouse; normally we keep it tidier than this... But you can see the volume of clothes of all kinds.
Anyone who has worked in the music industry, like me, knows what a headache dealing with merchandising is. This is much more complicated; there are clothes and shoes of every kind and size for infants all the way to grown men and women.