Rubie's Costume Co Men's The Flintstone's Barney Rubble Costume, Brown, XL

is the small size the size of the model for Betty Rubble's costume? if so, im her size, but five months pregnant...should i get the small or medium?

The size chart is confusing, i wear xl shirts, but 42" pants, and according to the chart plus size would fit the waist right?

I wear a 3XL shirt would the one size fits all fit me?

Is the "medium" size really the xl? the sizing choices are one size and medium, however the description says standard and x-large.