Question about the fully body of fursuit

I have a question about how to make a fursuit (with fully joined body)
example: http://fc00.deviantart.net/fs71/i/2012/204/e/d/mlp_pony_fursuit_costume_new___firesparcle____g3_5_by_atalonthedeer-d58e1ja.jpg (by Atalonthe Deer)

but I can do it with duct tape, for example. (I know how to do a duct tape, but I don't know what to do with it later. especially if I have to make a costume with digitigrade legs and hoofs.)

Or is it better make the costume with a "body" (the suit that covers the entire body mostly used for gymnastics) ? and place foam after... How in this case is cover with the fur?
http://fc05.deviantart.net/fs70/i/2013/065/d/a/riley_the_gsd__wip2__fc_photoshoot__video__by_caninehybrid-d5x0dl7.jpg /by caninehybrid)

i'm very confused about this and I wish someone would explain in detail that I should do (or a tutorial.)

Thank you.