Help with cycling sizing clothing

Hello,
New to the biking world need help with sizing and suggestions. I'm 5'6 165lbs 40 inch chest and a 34-36 inch waist i have a slim build but a little flab in the stomach area that i'm working on losing hence getting into biking. I am not looking at racing just recreational not a fan of super tight slim fit jerseys. Read that Assos T.centro was a nice bib also read that they have some jerseys that have a regular fit. Same with castelli but have no idea what size to get and there are not a lot of bike shops around me that carry them. Any help would be great i'm sure there is a post on here about the sizing but hard to tell given all people are different sizes thanks in advance.
New to the biking world need help with sizing and suggestions. I'm 5'6 165lbs 40 inch chest and a 34-36 inch waist i have a slim build but a little flab in the stomach area that i'm working on losing hence getting into biking. I am not looking at racing just recreational not a fan of super tight slim fit jerseys. Read that Assos T.centro was a nice bib also read that they have some jerseys that have a regular fit. Same with castelli but have no idea what size to get and there are not a lot of bike shops around me that carry them. Any help would be great i'm sure there is a post on here about the sizing but hard to tell given all people are different sizes thanks in advance.
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In a casual shirt from Charles Tyrwitt I am a medium but I wear an XXL in Castelli!! In other brands I am a L (Torm for example) and in others XL. No rhyme nor reason.
So I guess it might mean trying some and sending them back if they are the wrong size.
For reference I'm 5' 7" and a bit, 63kg (about 139lb) 37" chest and about a 28/29" waist. Like a lot of folk I've got a longish torso and shorter legs. I generally wear XS bibs (like Rapha's Pro Team) and S jerseys/gilets/jackets in a race fit.
You're an inch shorter than me and (please don't take any offence as it'll hopefully be a reducing thing as you get the rides in) your middle is quite a bit bigger than mine, so chances are you won't fit an S bib in many brands. That means you want to avoid any kind of trendy Pro look long length bib shorts - which Assos is, amongst other, guilty of. It results in flappy leg openings. So you might want to get a few different brands.
For jerseys you should look at M sizes, but they might be a wee touch too long.
Only free if you return through Asda now, tuther options are £2.95 a pop.
Marin Palisades Trail 91 and 06
Scott CR1 SL 12
Cannondale Synapse Adventure 15 & 16 Di2
Scott Foil 18
Geez that sucks!! When did they bring that in? I'll be buying stuff from local shops from now on if I can find any.