Hey I’m new to this page but I was wondering if anyone here could help me out with picking the right size for the Halloween 2018 coveralls. So basically I’m around 5’5 or 5’6 and I cant really decide what size to get I’m pretty skinny/slender so🤷🏽♂️… anyways any help would be greatly appreciated thank you! 
If you wear medium shirts, you’d want either somewhere around 38-40. If you wear large shirts, you’d want around a 42-40. That’s the pattern.
Edit: the numbers represent the circumference of your chest.
Measure the circumference of your chest. The size you want is one size up from whatever number you got. If you got 34, buy 36s. If you got 38, buy 40s. For the inseam, which is the length from crotch of the pants down (it’s the second number if you look at the tag on your jeans), always add two to what you normally buy. My first pair of coveralls I bought, I did the chest rule of going up a size, but not the inseam rule, and bought 36 R (R as in regular size). I’m 5’9, chest 34, inseam 32, a skinny fuck. They were uncomfortably tight on me, length wise at least. I couldn’t raise my arms above my head without my crotch being constricted. I just recently bought 36 Ls (L as in long). They fit much much better. The site I used had this handy chart to help you.
I’d say for you, definitely get regulars and not longs. I’d reccomend using this site to order https://www.automotiveworkwear.com/RedKap/CT10/coveralls.html
Wait so that would make inseam, length?
Length as in Regular or tall? Yes.
Ok thanks, I’m about to grab some Red Kaps but was wiry on this.