Waterproof jackets - I use this one from Corinne Dennis and will probably buy another if it ever falls apart. It's 50 quid so cheaper than most, packs down to kagoule size but is actually quite substantial, which means it does a fairly good job of keeping you warm if you're off the bike having ridden through a thunderstorm; has two zip (waterproof) pockets which I find massively useful and I've had it for years and it's stayed waterproof.
Only problem is the sizing is a bit weird; I bought my usual size and it's a fair bit baggier/wider than I expected. Not really a problem for me (though it does turn into a comedy wind tunnel if I have it undone a bit on a windy day) but I imagine it could be a pain for someone taller and slimmer than me. They have a few stockists in London so you could try them out for size.
Tights: not sure... never used Decathlon ones. Maybe try some others - sounds like it could be to do with cheaper material losing elasticity perhaps? I have good Sugoi, Nike and Gore ones. I usually wear short liners under unpadded tights which might help keep them still. Possibly.
Waterproof jackets - I use this one from Corinne Dennis and will probably buy another if it ever falls apart. It's 50 quid so cheaper than most, packs down to kagoule size but is actually quite substantial, which means it does a fairly good job of keeping you warm if you're off the bike having ridden through a thunderstorm; has two zip (waterproof) pockets which I find massively useful and I've had it for years and it's stayed waterproof.
Only problem is the sizing is a bit weird; I bought my usual size and it's a fair bit baggier/wider than I expected. Not really a problem for me (though it does turn into a comedy wind tunnel if I have it undone a bit on a windy day) but I imagine it could be a pain for someone taller and slimmer than me. They have a few stockists in London so you could try them out for size.
Tights: not sure... never used Decathlon ones. Maybe try some others - sounds like it could be to do with cheaper material losing elasticity perhaps? I have good Sugoi, Nike and Gore ones. I usually wear short liners under unpadded tights which might help keep them still. Possibly.