Shelley is right..you need an embroidery machine to make them. If the embroidery was not what you were looking and you were interested in how to actually make the entire bloomer I think you should have wrote that instead of just typing "bump" as it comes off as rude to the person who tried helping you.
If you need help trying to sew bloomers then try the You Can Make This website. http://www.youcanmakethis.com/index.htm
? Hope this helps.