You can always submit your measurement after placing the order. For now, just select Customize with Made to Measure, click Add to Shopping Bag and complete order. Later on go to Account section, visit My Orders page and submit your latest measurement.
If your bare chest size measurement is 40 inches, you should select size 40 only from the drop-down.The Top chest attribute in the size chart refers to the garment chest size. It is inclusive of the required 3 to 4 inches loosening, to ensure the right fit.
If your bare chest measurement falls between 2 sizes i.e 37 inches, you should select size 38.
https://www.utsavfashion.com/product/woven-dupion-silk-jacket-kurta-set-in-white-mtx2323-sh222161294Woven Dupion Silk Jacket Kurta Set in Whitehttps://medias.utsavfashion.com/media/catalog/product/cache/1/small_image/295x/040ec09b1e35df139433887a97daa66f/w/o/woven-dupion-silk-jacket-kurta-set-in-white-v1-mtx2323.jpg197197USDInStock/men/men/plus/men/wedding/men/party/men/dupion silk/men/white/men/grey/men/kurta pyjama/men/buttons/men/contemporary/men/resham/men/zariWoven Dupion Silk Jacket Kurta Set in White <ul><li> Readymade Art Dupion Silk Jacket Kurta Set in White</li><li> This Chinese Collar and Full Sleeves attire is Enhanced with Buttons, Resham and Zari Woven</li><li> Available with a Art Silk Jacket in Grey and a Art Dupion Silk Churidar in White</li><li> Do Note: Footwear shown in the image is for presentation purposes only. Half to one inch may vary in measurement. (Slight variation in actual color vs. image is possible)</li></ul>USDtype_new:Kurta Pyjamacolorfam:White, Greyfabric:Dupion SilkWhite, GreyDupion SilkKurta PyjamaMenWithin 15 days, More than 15 DaysReadymadeWedding, PartyMenswearButtons, Contemporary, Resham, Zari36, 38, 40, 4244, 46, 48, 50, 52, 54, 56