maxima equestrian fly rug question

I don't have a TB but tried one on our warmblood who is not particularly deep through the chest or belly and the bellywrap of this rug was too loose for him. Their other fly rugs fit him beautifully, but I think the bellywrap ones are a better fit on a horse of more substantial proportions! (Pic of horse concerned second from right in signature photos).
 
I don't have a TB but a warmblood who is not particularly deep through the chest or belly and the bellywrap of this rug was too loose for him. Their other fly rugs fit him beautifully, but I think the bellywrap ones are a better fit on a horse of more substantial proportions!

thankyou :) and what size did you get him? his usual or one up?
 
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