One mushroom, tilted so the underside shows
A chanterelle drawn enormous and tilted to show its ridges rather than its cap argues that scale here does an identifying job, not just a decorative one.

One chanterelle, cream and ochre, drawn the size of a forearm. The cap is tilted back on its twisted stem so the underside faces out. No text, no label, nothing else on the shirt.
It's tilted for a reason. The underside is the part that tells you what you've actually found.
Why show the underside instead of the cap?
Because the cap looks like several other mushrooms and the underside doesn't.
A chanterelle from above is a funnel-shaped, apricot-coloured cap, and that description also fits the false chanterelle and, in poor light, one or two things you'd rather not eat. Turn it over and the resemblance stops: a true chanterelle has blunt, forking ridges running down into the stem, not true gills. It's the single detail a forager actually checks, and it's the one this design chooses to put in front.
Why draw it this large?
Because at this size the ridges are still visible from across a room, which is the whole point of having them on a shirt at all.
A small print of a mushroom is a decoration; drawn forearm-sized, the fork-and-ridge pattern survives being reduced to a few confident lines and still reads as itself rather than as a smudge. Scale doing identifying work rather than merely graphic work is rare in this set — most of these designs are big because big is what suits the subject, and this one happens to also be big because that's what makes the detail legible.
Is a tilted mushroom a strange thing to put on a shirt?
Less strange than a mushroom shown the way nobody ever actually holds one.
Anyone who has picked chanterelles has tilted one back exactly like this, checking the underside before it goes in the basket. The pose isn't invented for the drawing — it's the pose the object gets put in a hundred times a season by anyone who forages seriously, which is why it reads as correct rather than staged.
Does the same idea work for other mushrooms?
Some. A few common species are recognisable purely by silhouette and colour — a fly agaric's red cap and white spots, a giant puffball's plain dome — and those can be drawn face-on without losing anything. Others, chanterelles among them, are only reliably told apart by a feature on the underside or the stem, and for those, the same logic applies: draw the part that actually confirms it, not the part that photographs best.
Does anybody own the right to a mushroom?
No. A species belongs to nobody, and a drawing of one is your drawing, the same as any other living thing in this set. What can belong to somebody is a specific photograph somebody else took of a specific mushroom in a specific wood — if a real photograph is the reference, getting the photographer's permission is part of the job, the same as it would be for any other picture you didn't take yourself.
Is this only for people who forage?
No, though it reads immediately to anyone who does. A person who has never picked a wild mushroom still recognises a chanterelle's shape and colour, and the tilt reads as care even without knowing what it's for. It works both ways: a private nod to somebody who forages, or a plain, well-drawn mushroom to somebody who doesn't. The same overlap comes up with a leaf pared down to its essentials — the detail rewards knowing, without requiring it.
Does it print well?
Yes, in two flat colours with no gradient between them.
The cream of the flesh and the ochre of the ridges hold as separate blocks rather than a blend, which is exactly how the original tilt-and-check pose separates the two surfaces anyway. The ridge lines want to be fewer and slightly heavier than a botanical illustration would draw them — enough to read as ridges from a few feet away, not so fine they fill in on the weave. Moss green or a warm brown both suit the palette; a stark white shirt fights the ochre rather than setting it off.
How do I get one made?
Describe the mushroom at JustOG — species, how it's held, and how much of the underside should show. 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.
One mushroom, turned over, checked, and printed exactly as it looked in the hand.