So, washing...
i tumble dry everthing on low in thdryer, or should i say that is what i request...
If it shrinks a bit, it will loosen back up when you get it on again, noharm.
yes, it's not as easy as zipping up a front zipper...but then you keep them on longer.
and yes the neck is smaller, and doesn not strech, you cannot pull arms through the neck, nor usually pull arms inside at all...
Basically the way they are built it to keep hands out of the diapers and also keep them on, so no hand through the neck hole, nor pulling arms in, nor sorta getting in anything...sorta the point...
also in my case and feel many others, very relaxing, knowing that other then unzipping them, you cannot take off diaper or fiddle things, and taking them off whilst being possible is a bit more work and in all reality that time being tired and put hands in pants or something out of bordom or alike just doesnt happen and other than exerting some energy and getting up unzipping your just left snug anf comfortable without the ability for the most part to not just be small and innocent...
but, back on topic, if you wash and dry on low, they are fine, and drying on a higher setting or some shrinkage will losen back up once on for a few mins...
lastly, on sizing, i'm 5'11" and 230 and wear a size 18, this year is a bit bigger, im actually going to wash mine in hot to srink it a bit, as i like it not baggy at all, but size 20 is way too big on me, and long on the legs by far, even the 18's are a bit long, so hopefully shrink a bit...
i've have had these without the spandex for years, and some i still wear are 3-4 years old now, and still going, and they strech out and then shrink a bit in the wash every time, hug the body nice too...
the tag on them says supposed to fit snug, as not made of fire retardent fabrig, less likely to burn if skin tight, and to be honest hugging the skin feel great with this fabric...
wash away, and if they shrink they will loose up when worn.
as a side note, you can put on a zipper pull, or a thin string to help zip them up.
my way if i have to do myself is to zip up to above the waist without the arms or top on, then put in arms and pull the two sides close as possible to strech them a bit.
then push up the zipper (no need to use the tab to push it up), if it stops repeat the pulling the side together again as needed.
then when up as far as can with hand pushng up, switch to pulling the zipper up towards head and reach down and pull the zipper up.
the button thing is a bit tricky to do up...
zipper tab facing up, do the middle strap...
left the zipper tab fall down over the middle strap...
then do the upper and lower button for the cover over the whole zipper top.
that keeps the zipper tab down, and trapped between the strap and the cover so can't get pushed or anything to cause it to come down for any reason, you MUST then undo the snaps to get the zipper down no matter what.
in that setup, i cannot even feel the zipper in the back at all, small enough to sort be in the recess area of your back between shoulders on me, i cannot stand a zipper poking my chin, albeit i have sensory issues too...
Have a good sleep...they are sleepers afterall...but still great to lounge in as well...