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 product page. The "Top Chest" attribute in the size chart refers to the garment's 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/embroidered-art-dupion-silk-kurta-set-in-beige-mpw94457594Embroidered Art Dupion Silk Kurta Set in Beigehttps://medias.utsavfashion.com/media/catalog/product/cache/1/small_image/295x/040ec09b1e35df139433887a97daa66f/m/p/mpw94.jpg00USDOutOfStock/men/men/plus/men/wedding/men/art silk/men/beige/men/kurta pyjama/men/resham/men/traditionalEmbroidered Art Dupion Silk Kurta Set in Beige <ul><li> Readymade Art Dupion Silk Kurta in Beige</li><li> Enhanced With Resham and Stone Work</li><li> Available With an Art Dupion Silk Churidar in Maroon and an Art Silk Dupatta in Maroon</li><li> Do Note: Footwear Shown in the Image is for Presentation Purposes Only</li><li> Half to one Inch May Vary in Measurement. (Slight Variation in Actual Color Vs. Image is Possible).</li></ul>USDtype_new:Kurta Pyjamacolorfam:Beigefabric:Art SilkBeigeArt SilkKurta PyjamaMenMore than 15 DaysReadymadeWeddingMenswearResham, Traditional34, 36, 38, 40, 4244, 46, 48, 50, 52, 54, 56, 58, 60