Thank you for your feedback and we really appreciate you giving our shirts a try! We're glad to see several aspects of the shirts are to your liking and that you're happy with the quality overall. The Slim Fit shirts are our 'regular' cut - a great all-round choice if you are unsure which fit might be best. You can then adjust to either the Extra Slim or the Classic, based on the fit of the Slim.
For the sleeves, they can't be too tight as this will then likely cause them to catch on the elbow when the arm bends, increasing the chance of rips or tears in this area. The Extra Slim Fit will provide a slightly more 'streamlined' feel to the arms, however, so that may well be worth considering if you feel the fit in the body will also be acceptable. If you'd like to discuss possible return/exchange options based on the above, we're here to help through live chat or telephone and will gladly assist you in making your return if required.