The order matters because each step feeds the next: your mom's description sets the shopping list, the matching wallet gives the handwritten note somewhere safe to live, and the plain wrapping lets him react without an audience. Skipping ahead to the purchase leaves you guessing at color and fold. Done in sequence, the last step is just confirmation that the first four were right.
Step 1: Get the details from your mom
Everything downstream depends on details your dad would never volunteer, and your mom has watched him use that wallet for years. Ask for descriptions rather than opinions: bifold or trifold, navy or brown, back pocket or front, and what he complains about. Does he fold receipts into it or toss them? Do cards slide out? Is the stitching blown at the corner? Then ask the second question, which is the real one: why does he like it? The answer is usually small and practical, like 'it's thin enough for his back pocket,' and that reason should shape everything you buy next. Asking him directly is the usual slip. It tips the surprise, and he will answer 'don't get me anything,' which is a reflex, not information.
Step 2: Buy the match, not the upgrade
By now you have your mom's description in hand, so this becomes a matching job rather than a shopping spree. Set your number before you browse and stay inside it; the point of the gift is attention, not expense, and a wallet he's afraid to crease stays in the drawer. Shop for the specs she gave you: the same fold, the same color family, at least as many card slots as he currently carries, and a fix for whatever complaint came up in step one. If he keeps it in a back pocket and hates bulk, thin leather beats a big snap flap. A store that sells leather goods in person lets you check the stitching and press the fold with your hands. What wrecks this step is buying the wallet you'd want for yourself, all minimal and stiff, when he needs somewhere to put nine cards and a folded receipt.
Step 3: Write the line only he would get
The wallet is only proof that you noticed; the card inside is proof that it mattered. Write the line by hand in ink, small enough to sit flat. A card, not a folded sheet of notebook paper, because paper that's been folded twice makes a lump in the bill compartment and he'll feel it every time he opens the thing. Put it behind the card slots or under the flap where cash goes, not loose in the middle. Keep the printed line and add one specific thing underneath: a night he drove out to get you, a game he never missed, the way he always paid and never mentioned it. That second line is the part he'll reread. Typing the note, or writing three paragraphs, both miss. The card should be short enough to read in four seconds and specific enough that no other father could receive it.
Step 4: Wrap it plainly and say nothing
Comics pages do quiet work here. They cost nothing, they're funny, and they telegraph that this isn't a ceremony, which matters because a wrapped box with a bow forces a performance he'll be uncomfortable giving. Tape the comics around the wallet, no ribbon, no card on top. Then put it exactly where he sits when he gets home: his chair, his side of the couch, the driver's seat, the workbench stool. Leaving it on his chair without a note means the wallet and the card inside do all the talking, which is why steps two and three had to be right first. Handing it over while the room watches is the common misfire; he'll say 'you shouldn't have' and the moment evaporates. Also don't hide it so well that he finds it days later and assumes it's junk mail.
Step 5: Catch him using it, don't stage it
Give it seven days, because a wallet that doesn't fit his routine will be back on the dresser by then and you'd rather know. What you're after is a candid: him at the register, thumb on the fold, pulling it out without thinking about it. Shoot from chest height with the phone sideways, no flash, from a step or two back. If you're in the car, catch the reach to the back pocket at the pump. Never say 'hold that' or ask him to look at the camera, since a posed shot documents the object, not the change. One caution: if you plan to post it anywhere, ask first. Some fathers keep a low profile, and a photo taken for yourself still does its work sitting in your camera roll next to the picture of the old one.
A phone reminder about this gift vanishes the moment you dismiss it and leaves nothing behind. A printed strip taped inside a cabinet door stays there, gets visibly shorter as each line is cut, and only comes down once the wallet is sitting on his chair.