Gym set similar to gymshark

NOT GYMSHARK just using the name for exposure. This says it is a size medium but fits a size small. Bought it thinking it would stretch like a gymshark medium but it doesn’t have the same kind of stretch. A really nice set but definitely sized incorrectly. An XS or a S would be an accurate size range. Brand new never worn, the top has thumb holes in the sleeves which is cute. Beautiful blue color, shame it doesn’t fit me The size chart is in the photos provided this is a size medium on the chart