Gifts that do not require knowing a size
Short answer: Towels, bedding, socks and gift cards are the four that always fit. All four get used, and none of them need exchanging.
Towels suit everyone
A towel needs no size and is used daily. It is the safest textile gift. See bamboo towels.
Bedding only needs the bed measurement
Bedding requires one measurement you can ask about without giving away the gift. See bamboo bedding.
Socks have a wide range
One sock size covers four shoe sizes. That makes the risk of missing small. See bamboo socks for women.
A gift card as a last resort
If you are completely unsure, the recipient chooses. That beats a gift that does not fit. See Christmas gift ideas.
Frequently asked questions
Which gifts require no size?
Towels, bedding, socks and gift cards. All four get used and rarely need exchanging.
How wide is a sock size range?
Usually four shoe sizes. That makes socks one of the safest clothing gifts.
What if you only vaguely know someone's taste?
Choose something neutral for the home. That is easier to get right than personal style.