How much improvement does skintight cycle clothing have on average speed? Assume your on a flat road with light head wind. Do you feel like you go faster with aerodynamic clothes when compared to normal clothes.
My advice. Save yourself $3500 on zipps and get your mum to make your club jersey's a tighter fit . Thats what I did with my jersey and it now fits perfectly...not close to a skinsuit because the fabric is different but there isn't any "flapping" anymore just a few creases.
My formerly loose jerseys aren't flapping anymore either, but I wouldn't recommend getting them tight using the method I used (hopefully they'll be loose again by the end of the season)