MIL buying my kids clothes

Ri

So my MIL is not involved really at all with our kids her choice. About once to twice a year she asks what size clothes they are. I always tell her their current size and what I predict their next size and season to be. I always warmly accept these gifts she gives them and even try to put the kids in her clothes when she does see them.

Here is my predicament. They never fit them. They are hideous.

Examples

For instance she got them matching tshirts when my youngest was born and my husband was upset because we have boys and she bought them expensive girl shirts. I still put them in them to please her but that's the only time they wore th because they were also wrong sizes.

She also asked for donations for clothes from her church (not condoned by us we clothe our kids just fine.) She got angry at me for something else. She dropped all of these used stained too small of clothes on our porch. Like boxes and boxes tons of them. Took a whole day to deal with them. She was mad that they didn't fit our kids.

She got mad after the birth of our first because she said I didn't need to get the baby clothes because she kept all of my husband's clothes till he was two. My husband is 35 so these clothes were over 30 years old. I told her one or two pieces that were special we would love for our son. She was then angry and gave our son none.

Our kids would love to spend time with her or other useful gifts. She just wants to get them clothes. Do I just keep accepting these to keep peace? Telling her they are good on clothes makes no difference to her. They are also very much not well off and I know money is tight.