I tend to think that if someone has given you something, whatever it is, it is gracious to thank them, not quibble about whether its just right or not. re-gift it if it not suitable.
my brother and SIL bought me some football sockz. I don't play football or anything, any sport. but I do like long socks and they were very long, and in bright colours I like. but they were too small. I cannot stand anything too tight on my feet. however, it gave me an idea, to look for very long socks among football gear. but will wait for cheap, out of date strips ?. I thanked them for the gift and how nice and long they were. didn't mention wrong foot size. now looking for some youngster or smaller=footed person who could use them.
it is the thought that counts. its not a commercial transaction, like ordering the right product. its an offering of friendship, care, affection, like an open hand. take it cheerfully. and give cheer back.