NYC-based women's clothing boutique sets up shop on Newbury St.. In Short Remember the dress you dreamed of as a little girl? Maybe it was pink silk, dotted with tiny white flowers, with a nipped waist and a flared skirt? Nanette Lepore makes that dream dress, in a hundred different variations--white eyelet for summer, brilliant orange flapper dresses for winter--for reasonable prices and in sumptuous fabrics. Also covetable: Smartly cut pants, dainty sweaters, Victorian blouses and button-front skirts.