A life list is a diary that looks like a table
Birdwatchers keep a numbered list of every species they have seen, with dates. Printed as two columns it reads as a graphic and, to them, as twenty years.

Two columns, numbered one to forty, each line a species and a date. At the top, a place and a season. At the bottom, one entry in a different hand, added later.
To anyone else it's a nicely set table. To the person who wrote it, it's twenty years.
Why is a list the right subject?
Because listing is the hobby, more than looking is.
Birdwatching runs on records: a life list, a year list, a garden list, a patch list. The list is how the activity keeps score with itself, and it's kept by people who otherwise keep score with nothing.
A painting of a kingfisher is a picture of a bird. A list is a picture of a person's attention over decades.
What makes it personal rather than generic?
The dates, and the gaps between them.
Forty species with dates spanning fifteen years shows the shape of somebody's life — the cluster from one good trip, the four-year gap, the one that took until last spring. A birder reading their own list is reading weather, holidays, illnesses and a divorce.
That's the same reason a real number outperforms a place name. The data is the memoir.
Should it use common names or scientific ones?
Common names for a gift, scientific for a certain kind of birder.
Common names carry affection and are readable to family. Binomials look like a nineteenth-century plate and appeal to the more systematic end of the hobby, which is a real division within it.
Some birders will also want the sequence in taxonomic order rather than alphabetical, which is a detail nobody outside the hobby would think of and everybody inside it notices immediately.
Can it name a real reserve or observatory?
Places, yes. Organisations and their marks, no.
A headland, a marsh, a gravel pit or a stretch of coast is a place name and prints freely. A bird observatory or a conservation charity is a named body with a logo and usually a trading arm, so their identity isn't available for merchandise.
An invented station name at the top — set like a header on a recording form — does the framing job without borrowing anybody's.
Does it work for other kinds of collecting?
Directly, and the format is underused.
Munro lists, moth records, wildflower counts, fungi, dark-sky objects, lighthouses, railway stations, countries. Any pursuit that produces a numbered record of things seen has the same document, and the same twenty-year story hidden inside it.
The rarer the subject, the better it reads — a list of forty moths is more surprising as a garment than a list of forty birds.
Is it a good gift for somebody quiet about their hobby?
That's precisely who it suits.
Wearing a list is not a boast; nobody but another birder can even parse it. It's legible to the community and opaque to everyone else, which is the register a lot of people want and rarely find in merchandise.
Same reading as a crew list that names nobody in particular.
Does it print well?
With one adjustment: fewer lines than they'll want.
Forty entries in two columns is close to the practical limit at chest scale — a real list of three hundred becomes texture, which some people like and most find disappointing when it arrives. Around thirty to forty lines stays readable, and choosing which thirty is itself part of the gift.
Dust blue, slate, cream and olive all read as a printed recording form. One ink, with the header in the same ink at a larger size, is enough.
How do I get one made?
Describe the list at JustOG — which entries, with or without dates, and what the header should say. Pick a direction, drag the crop frame, see it composited on the real garment, and it's made to order and shipped.
Designs other people have published are in the shop.
Forty lines, and they remember the weather on every one.