We bought our sons-in-law, a tallis for everyday, one for Shabbos, NO atarah, that is “earned” with age.
They were given a choice, a gold watch or sefarim. One chose a set of Shas he always wanted, one “filled” in his Sefarim collection, and one chose a watch.
My daughters’ bought them gold cufflinks to wear at their weddings.
On BiG birthdays, with a 5 or a 0, they get a “special” gift, by choice, so far we have done a Silver seder plate, a Silver menorah, a Haggadah, a Haggadah cover (wood by choice)
Every now and then, I will buy them a nice shirt, or a tie for Yom Tov.
But, I try to be careful and not be too generous. You never know the financial circumstances of the machatenim.