The thing with going to a dress maker is that unless you have a
large budget you're probably going to end up looking like a cross
between the 1990s and the 2000 meaning very very passe .. sure the
custom fitting will mean emphasis on your strengths and the
covering of your weaknesses .. but chances are you're probably not
going to be the belle of the ball.
Anyway I don't think it's right for us bfs to interfere with our
gfs decision on prom dresses .. My own opinion least .. my gf had a
great time shopping with her friends, doing their make up and hair
together .. almost like a hen party .. i think what you probably
should do is just wait for her to choose a dress and buy her an
exquisite pair of shoes, earrings, or necklace, something to make
her feel like she's your princess. Trust me, by doing that, you're
setting yourself up for an all night long after party 
Warmest Regards,
SupaFatty
EDIT: just had to remove a major language oversight
