I feel that there are 2 things that are quite important here:
1) Beware of the exposure's impact on color and texture of the clothings, especially on white e.g. wedding gowns... people tend to notice wedding gowns for their patterns, embrodiary, beads, lace, intricity of design, material etc.. if the shot is over exposed, the gown might come out as just a white sheet and all details are lost. if the shot is under exposed, then the details wouldnt stand out.
2) Adjustments of clothings i.e. take note how the clothings are being worn and not just shoot without seeing. sleeves to be equal length, buttons are all up, make sure the zip is zipped, skirt is not hitched, bra strap concealed, visible panty line (VPL) hidden etc.
I think once you are able to accurately catch the intricate details of the clothings and start developing an eye to spot 'dressing blotches', you can then start exploring with other aspects of honing your skills.