Castelli bib advice please

I recently picked up a bargain pair of Castelli Free aero bibs with the Progetto x2 pad after hearing so many times how good they are. They were discounted because they are XXL, I am a large in "normal clothes" and have read that Castelli come up small and to go up 1 or sometimes 2 sizes.
They have arrived and after trying them on they do appear to fit ok, certainly in the lycra/pad sections, my only concern is on the leg gripper bit where they aren't really under any tension. They aren't baggy and there are no flappy bits or sections not touching my leg, they just aren't tight or stretched at all. I don't want to test them on a ride and take labels off etc only to find they ride up, from experience of these can anyone advise if they are likely to be a pain? How tight should the leg grip section be in order for them to stay put?
Thanks in advance
They have arrived and after trying them on they do appear to fit ok, certainly in the lycra/pad sections, my only concern is on the leg gripper bit where they aren't really under any tension. They aren't baggy and there are no flappy bits or sections not touching my leg, they just aren't tight or stretched at all. I don't want to test them on a ride and take labels off etc only to find they ride up, from experience of these can anyone advise if they are likely to be a pain? How tight should the leg grip section be in order for them to stay put?
Thanks in advance
Vaaru Titanium Sram Red eTap
Moda Chord with drop bars and Rival shifters - winter/do it all bike
Orbea Rise
Moda Chord with drop bars and Rival shifters - winter/do it all bike
Orbea Rise
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FWIW, I needed to go up one size to an L. When I put the shorts on the leg gripper is a little loose but when I get on the bike it just fits perfect. I wear leg warmers all winter (Nanoflex) and the combo works really well.
Might be worth doing a gentle turbo session if you can, see if the shorts ride up a bit and then grip as your legs expand with activity too?
I can't believe that an XXL could actually fit me to be honest, in all other walks of life I'm considered pretty slim but in cycling I feel distinctly portly! (6ft tall and 13st or 1.82 and 83 kgs in old money) I am targetting sub 80kg hopefully for the summer though even though the OH moans I'm too skinny then....can't win!
I'll have gentle spin tonight and see how I fare with them. Cheers
Moda Chord with drop bars and Rival shifters - winter/do it all bike
Orbea Rise
You were right Gaz, a little too big unfortunately
Oh well, back they go and I'll keep looking for a bargain pair of XLs!
Moda Chord with drop bars and Rival shifters - winter/do it all bike
Orbea Rise
You'll like them in XL, the fit is spot on.
Can someone clarify if wearing Castelli Cafe team kit qualifies me as a FKW? I'd be disappointed if it doesnt.
Moda Chord with drop bars and Rival shifters - winter/do it all bike
Orbea Rise
Moda Chord with drop bars and Rival shifters - winter/do it all bike
Orbea Rise