Your design is love!
heart People will always find something to criticise. Don't let that put you off. My advice is to make sure you have fallen in love with every aspect before you start making it. Fall in love with the design, fabric, lace, ribbon and if you don't absolutely love something about any of those things, change them.
1) I think thin satin ribbon looks nice. I used it on my strawberry blouse that I made (as corseting) and I am totally in love with that top. Pics are posted in
http://www.gaiaonline.com/guilds/viewtopic.php?t=14043285 currently the most recent post. I can see why people don't like lolita clothes made entirely out of satin, but personally I have nothing against satin accents and I use and enjoy them all the time.
2) I'm not sure whether or not corseting looks costumey. I just think it looks lovely
smile As Amani said though, it will create the illusion of more width because of the way it draws the eye in a horizontal manner. But I don't care what I look like in lolita clothes anyway, so that wouldn't stop me.
3) Look around at all different types of lace and decide for yourself which type you like. Maybe look at pictures of finished products with those kinds of laces on too. You really have to love the lace you put on something. Personally, I don't like the look of the super expensive lace I've seen, because the designs are always dull or old fashioned. I used polyester lace on my accessories. On my strawberry top pictured above, I used cotton or polycotton embroidered lace with holes. I can't remember the name of that kind of lace off the top of my head.
Extra feedback about your design:
Are you making the top too? Personally I like it, but I don't understand the second elastic channel in the sleeves. That's the only part of your whole design I don't like
smile That skirt is love. I want to make one like that too someday. Let me know how yours goes please and what pattern you use (if any).
Have fun sewing! I love making lolita clothes! I only wish I knew about this fashion when I was doing high school sewing!