Which board would be the least suitable for sewing into clothing?

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Wearable electronics demand boards that sit flat on fabric, can be stitched with conductive thread, and tolerate gentle washing. The UNO is the least suitable because its design is built for a desktop Arduino setup, not for sewing into clothing. It uses a USB-B port that sticks out from the edge and tall through‑hole headers, making it bulky and awkward to stitch into fabric. The edges aren’t friendly for fabric, and there aren’t sewable pads or fabric-safe connection points, so you’d need extra mounting hardware just to attach it. In contrast, LilyPad boards are expressly made for wearables with round, sewable pads and connectors designed for stitching into fabric, plus a low-profile footprint. Mega and RedBoard are larger or more traditional Arduino form factors and, while usable for projects outside wearables, don’t offer the same sewable, fabric-friendly design as LilyPad, leaving the UNO as the least suitable choice for sewing into clothing.