hmm; sewing can be pretty hard; especially comlicated stuff which is fitted; as a lot of lolita is..
have a look at "normal" patters, and see if you can adjust them towards a more lolita look... goo companies are
McCalls,
Butterick or
Simplicity...
also try looking on some sewing forums; and also cosplay.com has a lolita forum with some good pointers
hope this helps!