Hello, please let me help you answer this question. I think this year is your mother's birth year, so it's best to consider red things as gifts, because people wear red in their birth year. You can buy a set of red underwear for your mother.
Now you can't give thermal underwear, because winter is over, but you can give red underwear, and a red belt. Although this is superstitious, it can also bless your mother to be safe and sound. Your mother will definitely be surprised by your attentiveness. Let your mother know that you are no longer a child and can take care of her. Your mother will definitely be very happy.
You can also give other gifts. If your mother loves beauty, you can give her a set of cosmetics. Everyone loves beauty. I hope your mother will stay young forever. You can also give your mother a necklace or lipstick. These are all good choices.