In case anyone is still looking for rugs... We have the WB summer sheet - its white, with green check and full neck. Its AWESOME. Had to change - madam is so easily rubbed by EVERYTHING, that snuggy hoods had started to make her legs bald at the top LOL. This is like the Rambo SI hoody, 1/3 price (aprox £35), made of ripstop and silk lined shoulder and tail.
As fly spray we were using citronella oil, which sticks fab - and didnt aggrevate skin when sprayed on. Just used it neat, its about £7 for a litre or two form B&Q.
That said, our best results have been with bute - but she actually doesn't have sweet itch now... but theoretically should help SI too as it is an anti inlfam. Her itching just dropped off the map altogether!!!!!!!!!!!!!!