Proof of Concept
First rise. Bench rest. Final proof. Repeat.
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Shipping & return policies
- Order today to get by Aug 4–13Made to order — printed after you buy, then shipped.
- Returns & exchanges accepted within 30 daysUnworn items with tags preferred. Full policy
- Ships fromCharlotte, NCShorter shipping distances are kinder to the planet
- Cost to ship$4.75 · US ordersExact rate confirmed at Shopify checkout
What to know
- Materials
- Cotton
- Fabric
- Heavyweight garment-dyed
- Made to order
- Yes
- Fit
- Unisex · S–3XL
About Proof of Concept
Proofing is when the dough becomes the loaf — when carbon dioxide builds, gluten relaxes, and the structure that will hold the bread together quietly assembles itself. It's also a metaphor most home bakers eventually internalize: trust the process, give it time, don't rush. Mauve on navy. For people who set timers and watch them.
What Crosodo buyers say
Ratings for Proof of Concept reflect verified Crosodo buyer feedback published on Google Store reviews and collected after purchase through Google Customer Reviews.
5.0 out of 5 · 1 verified buyer review
“Ordered a Crumb queen tshirt and Butter tshirt! Great for sourdough baker gifts and for myself.”
Prefer another store? We're there too.
Buy directly here, or shop the same designs on the channel you already trust. Same tees, same heavyweight garment-dyed cotton.
Proof of Concept is a Crosodo vintage-varsity t-shirt design from Volume I, No. 06. First rise. Bench rest. Final proof. Repeat. Heavyweight garment-dyed cotton in Mauve / Navy, available on crosodo.com and Etsy.
Materials, fit & care
Built to be worn hard and washed often — at the Saturday market, in the kitchen at 3am, and everywhere in between.
Comfort Colors 1717 (6.1 oz garment-dyed) for the vintage hand-feel, or Bella+Canvas 3001 where a smoother print surface suits the design. Pre-shrunk and softer with every wash.
A slightly relaxed unisex cut from S–3XL. Size up one for an oversized look. The garment-dyed cotton drapes rather than clings.
Direct-to-garment with food-contact-safe water-based inks, so the print breathes with the fabric instead of sitting on top of it. Bake in it — flour and butter wash out cold.
Turn inside out, machine wash cold, tumble dry low or hang to dry. No bleach, no ironing directly on the print. The color deepens slightly as the garment-dye settles.
For the baker who has every tool but no good shirt
Proof of Concept is an easy gift for the sourdough-obsessed, the cottage baker running a home business, or anyone whose weekends revolve around the oven. Unisex sizing makes it low-risk, and every order comes with our free Cottage Baker's Field Guide PDF — a 50-state cottage food law reference to print and tape to the kitchen wall.
