Why does this happen?

Moths are infamous for doing this, but also there are other insects that can cause it: Skin Beetles are one example(Carpet beetles). If this is the case, you want to check your clothing, closets and dressers for evidence of further damage or of the bug(bugs) itself. Some types of skin beetles have notable evidence (larve looking like very tiny lightbrown firs/evergreen leaves). This could also explain the holes you see if you leave summer or winter clothing in a long place due to seasonal difference (as insects have much more time to your clothing, undisturbed). Insect repellants, moth crystals, and other related objects can help, but please be sure to check for health and safety to human use. Its also possible the loads you are doing are far too big. You may also be using too strong of a detergent, but on your description, this doesn't seem possible. You may still want to doublecheck either of these. There is also the chance you are wearing/tearing the cloth in a certain fashion, but unaware of it. Wearing habits can show up on clothing (stretching, be it major or minor). It could also be the durability/craftsmanship of your clothing.

I had that problem and finally figured out it was because I was wearing my keys on my belt loop and using a laundry press. Rubbing again the press as I was working was wearing tiny holes in my t shirts. Other than that I have found that a moth will eat tiny holes in your clothes.

Sounds like your shirts are getting caught on the agitator in your washing machine. All I can think of to prevent this is to wash on a cycle that is lower than the one you are currently using. You are not alone, this happens to my sons school shirts sometimes.

hmmm thats a strange one, I guess it can only be either the zippers or maybe some insect when you hang it out to dry I guess, I think their is an insect that gets attracted to mainly white clothes, I hope you find a solution...

Your dryer is eating little holes into your shrits LOL Im not really sure why that happens my fiances shirts do that also but i dont have a problem with mine

Hmm. I don't have this problem. I wash my clothes with other items that have zippers in them all the time. What I would suggest is that you wash your shirts in a delicates bag. it might be a pain in the butt, but it should protect them. Also, have you tried just washing the shirts on their own? I really don't know why this is happening, perhaps it's your washing machine? I hope someone else else can help.

that's strange... honestly, i never have this problem before... so i am sorry that i can't help you... all i can say that i wash all my t-shirts in a washing bag and the bag keep them from ruining... so i don't really know why your t-shirts got tiny holes at the bottom of them... hope somebody else can help you and give you a solution to prevent it from happening again... good luck...

Thank you for the best response. I used to have holes in my underwear, until i learned about using the right detergent or putting the water in first It works.

If you have a top loading washer, put the water in first, and THEN add the detergent. If you are using a front loading washer, use the hi efficiency detergent and only put the amount it says. It is caused by the detergent getting on your clothes dry. It would help mixing your clothes so that the t=shirts are protected in an old towel so if you do use a front loader, the t=shirts will be protected. I use Sunlight liquid and a bleach alternative and vinegar for rinsing since I am allergic to the perfumes and most fabric softeners.

I was going to suggest that maybe the shirts are being caught in your zipper, but if zippers are not the problem -hmmm, are you in the habit of tugging at your shirt's hem? do they seem too short on you and you like to pull them down often? does your toddler yank at them? my brother always had holes in his like this but they were near the collar, and I think it was because he always chewed on them, lol.

Don't you hate that. I honestly believe that clothing material is not as good as it use to be. Buy some fraycheck, you can find it at Walmart or Joanne's. Once you noticed a tiny hole put some of that on before you wash the item again, and it will help it from getting bigger. Make sure you let the fraycheck dry before you put it in the wash. I have been using this for years and it works great.