Some helpful hints:

If your item has its original retail tags still intact, please leave them on.  We can command a higher asking price for a brand new item.

Small investments can bring great rewards:  a lint brush, an electric clothes shaver/de-fuzzer, a reinforced button, etc.

Be extra vigilant when checking around areas that can show wear:  elbows on jackets, inside the collar and on the cuff for white items, the point where the inseam meets on a pair of trousers, buttons at the chest area on a button-up shirt, etc.  If you ensure your items are in perfect condition when they are brought in, it will allow the intake process to be quicker and smoother.

Turn your items inside-out before washing them -- it will cause less wear on the "important" side of the fabric.

If your shoes came with a box, bring that in, too. Be sure to clean EVERYWHERE with footwear, including the bottoms/soles of the shoes.  The cleaner/newer-looking the item, the higher the returns.