Apple Watch band size for gift

I would not usually suggest a Solo Loop band here. Those require sizing.

The other standard not-solo-loop Apple bands are all quite adjustable, and will fit most wrists. The Sport Loop, Leather, or Milanese, for instance. One of the Sport Loops is 130 to 190mm for the smaller 41mm Watch and 145 to 220mm for the larger 45mm Watch, and which fits most folks for each of the two Watch sizes. Most other bands are in those same size ranges. And are adjustable. (Apple publishes the length specs for the bands, if that helps.)

An Apple gift card can avoid this whole question.

Apple typically has a 14 day return-for-refund policy.

Gifting - Shopping Help - Apple

You can buy an apple watch band as a gift and it would come with a gift receipt. If the Apple Watch band does not fit, the person you are gifting it to can go to an apple store and exchange it for no additional cost.

Those with smaller wrists will want to opt for the smaller Apple Watch options, while larger wrists will need the bigger models. The 40/41mm Apple Watch models are designed to fit wrists sized 130 to 200mm, while the 44/45mm Apple Watch models are sized to fit wrists between 140 and 220mm.

It's holiday gift season. From Apple:

Holiday Return Policy

Items purchased at the Apple Online Store that are received between November 4, 2022 and December 25, 2022, may be returned through January 8, 2023. Please note that all other terms and conditions provided in the Apple Online Store Sales and Refunds Policy are still applicable with respect to such items purchased. Items purchased by carrier financing are not eligible for extended returns and are subject to the Standard Return Policy. All purchases made after December 25, 2022 are subject to the Standard Return Policy.

You're very welcome!