When I read other reviews on sizing, it seemed that the popular consensus was to order a size or two above the recommended sizing chart.  However, they seemed to have cured the issue of sizing charts.  I'm 6 foot and 165 lbs and relatively svelte build.  I ordered an XL per the recommendations of other reviews.

This was a costume for a Stage Play and it was a bit long and not quite as fitted as I was hoping. I think the recommended Large via the sizing charts recommendation would have been suitable for comfort and size.  So I presume they have amended their product to more accurately reflect the actual size of costume.

Still, this is a body suit, so if your not built like Bruce Lee or close or wouldn't wear something fitted like this...there is only so much reasonable give to it's elasticity.  So if your robust, don't blame to the costume.  Also, the costume cleaned well and washed well and the zipper and build held up to 8 quick changes a week (quick backstage changes into costume).  It exceeded my expectations in that manner.  I would recommend this product.

Also, the vendor was quick with shipment.