they come in 3 shapes: 

Shortie - short legs and arms with micro-fleece style lining

Longie - long legs and arms with elastic straps at end with micro-fleece style lining throughout

Combie - same as longie but the torso is double ply, with micro-fleece style lining in arms and legs and the torso is the same texture outside as inside (the Combie is pretty much a shortie and longie stitched together to make a mega warm item)

All 3 shapes have a double zip - this allows men (or women with she-wee device) to be able to have a wee without removing the garment. They also have a small hole near the belly, it seems this is so you scratch through it! 

- we believe these will fit unisex

- we'd advise that the collar-to-crotch measurement is the most critical, then pick your nearest chest size, 

these stretch more left/right than up/down. 

- arms and legs are of a standard size to suit the collar to crotch measurement, and for you they may come up a little short or long, that's to be expected... you can make up any difference that with gloves / socks etc.