When it comes to finding the "most custom fit" clothing or accessory, there are a range of synonyms you could use to describe it. Some may say "tailor-made", "bespoke", or "made-to-measure" to connote the idea of personalized fit. Others might use words like "perfectly-fitted", "made-to-order", or "custom-tailored" to emphasize the precision and accuracy of the fit. Some may opt for more casual terms, like "made just for you", "handcrafted", or "individually-crafted". Ultimately, the choice of word will depend on the specific context and desired tone, but any of these synonyms can convey the idea of a personalized and expertly-crafted fit.