My friend bought a lot of clothes for my children. What words should I use to express my gratitude?

Although the friendship between friends can't be measured by material things, friends still pay great attention to buying a lot of clothes for your children. At least, the other side cherishes your friendship. Maybe you helped her, but since your friend bought clothes for her children, you must express your gratitude. For example, I'm really sorry that you spent so much money. The clothes you bought are beautiful, and the children like to have dinner together next time. Just forget it． What's the use of you here? I will try my best to help. The child said it was great. This is tailor-made for him. It's beautiful and suits him well. The child said that he would like to thank this aunt and let her come to our house in the future. I also want to thank her in person. The child is innocent and won't lie, so I still want to say thank you.