Some things are so simple. Give your clothes the sniff test. That's right. Get your nose in and sniff those pits, and if they don't smell and if you didn't sweat right through your t-shirt or spill red wine down your front, hang it up on a hook and let it air and wear it again.
Sniff. Hang. Repeat.
Save water. Save energy. Save detergent. Save your clothes.
And as a little decluttering bonus, take a pic of your hooks every day for a little while and you will see which of your wardrobe you actually wear. Donate the rest. Woohoo.