Here is a list of mending/altering services which I could do for you:
buttons
button holes
rips/tears
loose/missing seams
hems
shorten hem
lengthen hem
zipper replacement/installation
raise neckline
lower neckline
remove/add sleeves
fitting (fit to body shape and size)
add boning (like a corset)
add/remove pockets
embellishment (embroidery, beads, sequins, ruffles, ribbon, appliques, etc)
install/remove patches (i.e. boy scout uniforms)
This list is not comprehensive. In addition to these things, should there be anything missing from the list, bring the article of clothing to me and I'll see what I can do.